My inference is that this picture was created by wind erosion. My evidence that supports my claim “It looks like wind erosion” is that this rock is out in the desert where there is a lot of sand that can create a sand storm. The stone is is chipped and sanded down, you can tell by the ridges on the rock, the shape of the rock, and the small pieces of the rock that have been broken of. Another part of why I think this rock has been eroded with wind is that there is a higher level of sand underneath this rock meaning that it was chipped off of the rock. These are some reasons why I think that this rock has been affected by wind erosion. Before this, I think that this stone could have been a huge boulder. I think this because you can see the rock
The St. Peter sandstone lies in an unconformity. It is 250 feet thick, it can be up to 500 feet thick and it fills erosional channels in the underlying strata. Buffalo Rock is an erosional remnant of Ordovician St. Peter Sandstone and overlying Pennsylvanian clastics. Sign for swift, turbulent, and deep water includes gravel bars and erosional features that are 180 feet above the current level of the river and massive cross bedded sand and gravel deposits along the river course.
...e morphed it into the quartzite that is seen surrounding the butte (4). Rocks that undergo this process are called metamorphic rock, which is the same as the rock seen years ago by dinosaurs and other extinct creatures. The quartzite rocks were formerly seafloor sediment that was forced upwards, and then surrounded by lava basalt flows. Once erupted through fissures and floods through out most of the area, lava flow eventually created enough basalt to form a thickness of about 1.8 kilometers (1). All of this basalt flow eventually led to the covering of most mountains, leaving the buttes uncovered. The igneous lava flows and loess is reasons that the Palouse consists of such sprawling hills, and rich soil for farming (2). In result of the lava flows, the Precambrian rock Quartzite was formed. And lastly covered by the glacial loess, which were carried by the wind.
What Caused the Dust Bowl? One of America’s most beloved books is John Steinbeck’s The Grapes of Wrath. The book portrays a family, the Joads, who leave Oklahoma and move to California in search of a more prosperous life.
The rock coquina is originally a sedimentary rock. Sedimentary rocks are made up of sediments. The sediments are formed by the mechanical or chemical activities of the natural activities like running water, blowing wind, glaciers etc. this which causes disintegration and decomposition of the pre-existing rocks. The products of decay are transported to some depositional sites by the natural agencies, where they get deposited and with subsequent compaction form sedimentary rocks (Hefferan, O’Brien, 2010). . The sedimentary rocks usually accumulate under a great variety of conditions. This shows the variation in rock, chemical structure as well as in texture. Weathering is the most important process that operates in the formation of sedimentary rocks. Weathering takes place by three methods as: mechanical disintegration, rock decomposition, and biological weathering. Mechanical disintegration is due to frost action, thermal expansion and contraction, aided with gravitational forces. Due to mechanical disintegration, the reduction of size and desegregation of rocks takes place. Chemical weathering is the use of the chemical elements of the atmosphere such as moisture, carbon dioxide, and oxygen (Hefferan, O’Brien, 2010). . This depends on the composition of the rock and the size of the particles that make up them. Biological weathering is a form of weathering caused by growth of roots and burrowing of animals. The environment of a sedimentary rock can show the deposition the quality and quantity of the deposition is affected. Sedi¬mentary rocks differ from environment to environment. These environments include the continental environments such as estuarine, lacustrine (fresh and salt water), deltaic, glacial. Anothe...
More controversy concerning Stonehenge is that of its construction. The largest stones, known as Sarsens, are found naturally as huge boulders in an area 20 miles to the north. The smaller Blue Stones have been shown to come from Preseli Hills in Wales. Popular theory suggests that the stones were brought on rollers. The distance of 20 miles is just possible to imagine them being brought on rollers. Another solution is that the stones were brought to Salisbury Plain by a glacier. The glacier theory was, until recently, rejected by geologists, thought of as being impossible. In 1991, new evidence was found suggesting the glacier theory may, after all, be the answer.
The most difficult to identify was the beach ridges and the sand dunes. We were not really postive about the appearance of the beach ridges and
“Concretions, which are compact masses of mineral that form within a pre-existing rock. These nodules are often spherical, elongate, and are harder than the rocks that contain them. They develop around an irregularity within the rock that serves as a nucleus, often a piece of shell, a pebble, or just a harder spot in the rock. As water runs through the rock, it deposits minerals at these irregular spots. Most of the concretions are in the Cliff House Sandstone” (Service, National Park). “Other features are on many of the cliff faces, called desert varnish. Desert varnish forms when manganese, a mineral found either within the rock or in windblown dust, is fixed to the cliff face by bacteria. The bacterial action occurs on the portions of rock wet from runoff water, causing a streaking effect” (Service, National Park). Another distinctive feature called turtle back weathering, develops in the Cliff House Sandstone that is exposed and unprotected on mesa tops. Originally, there was about 1500 feet of rock atop the Cliff House Sandstone. As this overlying rock eroded away, it released a tremendous amount of pressure on the sandstone. The pressure release caused cracks to form in the rocks. Water then weathered these cracks through freezing and thawing or by dissolving some of the
...hy this is like this is because this picture is taken of ruin called cliff palace in mesa Grande. The ruins are getting older and therefore are not as new looking as they were 130 years ago. This photo is really cool to
This image is depicting a rock fall, there are huge boulders on the bottom of the area blocking the road. There is no water so it seems to be a free fall of rocks from the top of this mountain region, and fell to the road on the bottom with the influence of gravity.
Those three works are igneous, sedimentary, and metamorphic. In the rock cycle you have arrows that indicate a process that link each group to the others. Also the arrows show that a rock from one group can be transformed to either of the two groups or it can recycled back to its own group. The process is consist of cooling, crystallization, weathering, lithification, metamorphism, and melting. The paths shown in the cycle are not the only ones possible. Others paths are just as likely to be followed as those described in the preceding section. We can observe different paths of the cycle by operating over the
It is located in Flagstaff, Arizona and is a United States National Park. Many people consider it one of the 7 Wonders of the World because it is amazingly beautiful. It stretches 18 miles across and is 6000 feet deep (Science Kids). The Canyon contains many different types of rock, including limestone which is located at the top and schist which is located at the bottom that is about two billion years old (Science Kids). This great wonder contains the three classes of rock: Metamorphic, Sedimentary, and Igneous. Both weathering and erosion occur in this landform because the temperature changes and because the Colorado River runs through it, eroding the sides for thousands of years creating a steep slope. Weathering and erosion occur in every rock since The Grand Canyon is composed of mostly rock this is always
This is also the case for Yellowstone and Yosemite National Park. Near Inspiration Point on the Grand Canyon in Yellowstone, a boulder-sized piece of granite sits in the middle of nothing. It traveled a great distance on the Pinedale glacier from Beartooth Mountains, and then was left alone once the ice retreated (National Nature Park Service). This rock is different from others in the Yellowstone bedrock, and displaced rocks of any size, which have been moved by glaciers to a different location outside of their own geology, are referred to as glacial “erratics” (National Nature Park Service). Erratics cover a large majority of Yosemite National Park. Yosemite is also home for "striations" which are groves and scratches in the valley's bedrock (Wirth). These markings simply prove that glaciers scoured their way through the valley. These glaciers, along with stream erosion, have also deepened Yosemite Valley, widened it and produced the incredibly steep valley walls like the ones we see in other parks that have been overrun by glacial
Hydraulic Action, when waves hit the cliff, air is forced into cracks, and then as the wave retreats this air expands explosively. Over time the cracks enlarge, weakening the base of the cliff causing erosion.
Weathering and erosion break the original rock down into smaller fragments and carry away dissolved material. This fragmented material accumulates and is buried by additional material. While an individual grain of sand is still a member of the class of rock it was formed from, a rock made up of such grains fused together is sedimentary. Sedimentary rocks can be formed from the lithification of these buried smaller fragments (clastic sedimentary rock), the accumulation and lithification of material generated by living organisms (biogenic sedimentary rock - fossils), or lithification of chemically precipitated material from a mineral bearing solution due to evaporation (precipitate sedimentary rock). Clastic rocks can be formed from fragments broken apart from larger rocks of any type, due to processes such as erosion or from organic material, like plant remains. Biogenic and precipitate rocks form from the deposition of minerals from chemicals dissolved from all other rock
Sediment maturity is due to the transportation and environment of sediment. There were two types of sediment maturity, the texture of grains and the composition in the rocks. Grain textures were the roundness of grains and sediment sorting and presence of clay (Bokman, 1955). The definition of roundness was the ratio of average radius of corners and edges and the radius of maximum inscribed circle (Richard, 1988). The rounding of grains was due to the energy, duration and mechanism of transport. Grain surface textures can be angular and rounded. Quartz was the most abundant minerals. We can use quartz for an example to classify the surface texture of grains. Angular grains of quartz would have conchoidal fractures and could be formed in glacial environment. Quartz grain which was water-deposited had rounded grain and grooves surface caused by impaction of other sediments (Richard, 1988). Quartz grain in aeoli...