Why do the continents move everyday? what is causing them to is caused by glaciers falling into the ocean for example rockford was caused by a huge glacier that’s why there are lots and lots of fossils at rockford, because the glaciers carried the fossils to rockford. the evidence of glaciers forming would be ice sheets and ice chunks were found on land and in the ocean, and it affects the earth because it’s putting more water into the oceans. plate tectonics also may have caused the glaciers to fall into the ocean when the plates move which causes the the glaciers to fall. Plate tectonics is the theory that earth’s outer core shell is divided into several plates, there are three different they are Convergent,Divergent, and Transform they all
15. The pictures above show how the continents on Earth’s surface have changed position over a very long period of time. What explains this change? (S6E5e, f)
Earthquakes are a natural part of the Earth’s evolution. Scientific evidence leads many geologists to believe that all of the land on Earth was at one point in time connected. Because of plate tectonic movements or earthquakes, continental drift occurred separating the one massive piece of land in to the seven major continents today. Further evidence supports this theory, starting with the Mid-Atlantic ridge, a large mass of plate tectonics, which are increasing the size of the Atlantic Ocean while shrinking the Pacific. Some scientists believe that the major plate moveme...
In the essay, “Global Warming is Eroding Glacial Ice,” Andrew C. Revkin argues that global warming is the primary cause for many of the world’s natural disasters; including flash floods, climate change, and the melting of the polar ice caps. He includes multiple accounts of expert testimony as well as a multitude amount of facts and statistics to support his theory that global warming is a threat to the world. However, in the essay “Cold Comfort for ‘Global Warming’,” Phillip Stott makes the complete opposite argument. He argues that global warming is nothing to be worried about and the melting of the polar icecaps is caused by the interglacial period we are currently in. After reading both of these essays and doing extensive research on both viewpoints, I completely agree with Revkin that global warming is an enormous threat to our world today. My research not only helped me to take a stand but it also showed me the invalidity in Stott’s essay.
The fiction story “The Icebound Land” by John Flanagan, it follows two characters, Halt and Will. Will, an ranger aprentice, tries to escape from his captivity of the Skandians with Evanlyn, the princess of Arulean. Halt acomponies Horace to find and save Will from getting traded away. The theme of this story is to save someone important to you at all cost.
People are responsible for higher carbon dioxide atmosphere emissions, while the Earth is now into the Little Ice Age, or just behind it. These factors together cause many years discussions of the main sources of climate changes and the temperature increasing as a result of human been or natural changes and its consequences; even if its lead to the global warming, or to the Earth’s cooling. In their articles, “Global Warming Is Eroding Glacial Ice” by Andrew C. Revkin and “Global Warming Is Not a Threat to Polar Ice” by Philip Stott, both authors discuss these two theories (Revkin 340; Stott 344). Revkin is right that global warming is taking place. Significant increase of carbon dioxide in the atmosphere is due to human activities combined with natural factors such as volcanic emissions and solar radiation – all together they lead to climate changes and temperatures rising. At the same time, other factors such as deforestation contribute to environmental changes for some glaciers not less than air pollution. However, during global warming not all regions of the planet are affected in the same way, local warming and cooling are both possible during these changes.
The Ordovician Period is the second period of the Paleozoic Era and began 485.4 million years ago and ended 443.4 million years ago (when the Silurian Period began). Four continents were present and separated by three main oceans. Laurentia was composed of present-day North America, part of Scotland, and Greenland and was near the equator. Siberia-Kazakhstan was east of Laurentia, slightly north of the equator. The Iapetus Ocean separated these two masses on the south from the continent of Baltica. Avalonia (England, New England, and parts of Canada) was to the west of Baltica. England, Baltica, and Kazakhstan were separated from Gondwana by the Paleotethys Sea. At this time, Africa and South America were rotated almost 180° from their current location. The Panthalassic Ocean covered the Northern Hemisphere almost completely.
First you might need to know definition of tectonics. It is a theory in geology. The lithosphere of the Earth is divided into a small number of plates which float on and travel independently over the mantle and much of the Earth’s seismic activity occurs at the boundaries of these plates. That is the official definition of Plate tectonics. secondly, this plate covers many parts of continents. plate boundaries don’t go according to Continents boundaries, they make their own boundaries. The North American plat...
Our planet has two glaciers of continental size, one being present on Antarctica and the other on Greenland. Observations made by scientists over the last thirty-five years all agree upon the notion of shrinking, and or retreating of the ice sheets. The melting of ice sheets has powerful implications for the millions of people who depend on glacial melt for drinking water and the millions of people who will be displaced by the sea level rise occurring as a direct result of the melting. The observations of ice melting also show that the rate at which the ice is melting is accelerating. Mountain glaciers around the world are also on the retreat. Some instances of particular mountain glaciers may show expansion, but studies done by glaciologists show that the total mass of glaciers worldwide is decreasing at an accelerating rate. These studies have been done by a number of different methods that all show a trend in the same direction.
One theory, which explains the mass extinctions of the Permian, is the reduction of shallow continental shelves due to the formation of the super-continent Pangaea. Pangaea at the time of the Permian extinction extended from pole to pole. It was formed about 300,000 million years ago by the collision of Laurasia from the north and Gondwana from the south. The super ocean Panthalasa surrounded it. The theory of the formation of Pangaea and the mass extinction occurred over 250 million years ago. The Pangaea theory states that all present continents were once together and collectively known as a super continent. The Pangaea was integrated at the beginning of the Permian time, and reached its acme during the late Permian to early Triassic. During this time the average thickness of a continental lithosphere was higher, and all oceans gathered to form Panthalasa. The peak of Pangaea and Panthalasa was a period of high continent and deep ocean, which unavoidably makes great regression and influence on the earths system especially climate. As mentioned above, during the formation of Pangaea there was reduction of shallow continental shelves. Such a reduction in oceanic continental shelve would result in ecological competition for space, perhaps acting as an agent for extinction. Pangaea broke up about 200 million years ago, and the split up pieces is what are earth is now. At the time of the mass extinction, Pangaea created glaciation, produced change in regional and global climates and caused marine deterioration. Overall this theory of Pangaea is sustainable, due to the fact that it happened during the early and middle Permian period.
Our great lakes hold about twenty percent of the worlds fresh water. While the other eighty percent is made up of salt water, the oceans. The world has a total of five great lakes. Many people always wondered how the great lakes were formed. Well there are some scientific evidences that’s proves that the great lakes were created by the formation of glaciers. This was known back then as glacial lake. During this process, huge sheets of ice that consume the land, and then stuffing the areas when the glaciers melts. While the glaciers are resting in the space in the earth, the weight of the glacier starts to force the earth’s crust down. When this process starts to happen, it is known as isostatic rebound and the formation is moraines. Moraines make up the border of the great lakes in the way
Human activity has major effects on geography. When studying the earth you can come to several conclusions about the geography of any particular civilization. Distribution of life in the civilization allows you to analyze whether their geography is their own destiny. Do people control their own destiny? Is geography something that people can control? Technology is really the key to why geography can be overcome by any people.
About 320 million years ago, precursors of Pangea Laurussia (combined Scotland, Greenland, North America and Russia) and Gondwana ( which was the rest of the earth's land mass ) converged and made a Godzilla continent surrounded by the huge panthalassic ocean. The collisions of Laurussia and Gondwana raised a mountain belt, present-day remnants of which are the Appalachians along North America’s eastern coast and highlands in central Europe. By 135 million years ago (dang plate tectonics, you move slow ) the breakup of pangea was well under way. Rifting and seafloor spreading opened the nascent North Atlantic Ocean between North America and the old continent Gondwana, in which South America and Africa were still Jointed. So wasn't that nice
Oceans are such so vast that people underestimate the impact their actions —seeming so insignificant— have on them. Humans have by and large taken the oceans for granted; not considering how important a healthy ocean is to our survival. A popular mind-set is that the oceans are a bottomless supply of fish, natural resources, and an infinite waste dump. There are myriad reasons why the oceans should be saved and the most obvious one is marine life. With 71% of the Earth being covered by water, it is obvious that sea creatures are predominant form of life, making up 80% of the species of life on Earth. However, as important as marine life is, that is not the only reason why saving the oceans is crucial. The ocean floor provides natural resources such as, oil, natural gas, petroleum, minerals, medications, and ingredients for foods and products. The economic benefits of the oceans are huge and significant, as well. Fishing and fish products have provided employment to 38 million people and have generated about $124 billion in economic benefits. However, oceans are on the verge of crisis, marine life, natural resources, transportation, the economy, and important ingredients are at risk due to overfishing, pollution, and acidification. Thus, in this essay I will argue that, oceans are not impervious to human activity and threatening the health of the ocean threatens the health of humanity, since oceans key to our survival.
There are many different glacial landforms created by glacial erosion, one of these landforms is U-shaped valleys or glacial troughs. This glacial landform has many distinct characteristics. One of these characteristics is that it has very steep valley sides caused by the glacier as it moves down the valley eroding the sides of the valley by the processes of abrasion and plucking. Abrasion is when the boulders and moraine carried by the glacier rubs and erodes the valley side as it physically moves down the valley. Plucking happens when the water in the glacier freezes inside of the cracks in the individual rocks on the valley side then the water freezes and as the glacier moves the rock is plucked or torn from the valley side producing the steep side to the valley.
Plate tectonics is the theory that landmasses on tectonic plates are in slow constant movement due to convection currents in the mantle. Plate tectonics, or the movements of plates above the lithosphere (the most upper layer of earth's crust) can cause divergent, convergent,and transform boundaries.A boundary the way two tectonic plates collide. is Continental plates are plates that the continents are formed on. Oceanic plates are plates that the ocean covers, and the oceans form on top of these plates. Convergent boundaries and divergent boundaries are ways that these oceanic and continental plates interact with each other. Landforms are formed at boundaries. The landforms formed at boundaries depends on the type of plates that collide, and