Essay On Earthquakes And Earthquakes

In this essay, the author

• Explains that powerful forces of nature can cause destruction to lives and property. while earthquakes and volcanoes help us determine and better understand their powers, they are natural phenomena that we need to learn even more about.
• Explains merriam webster defines an earthquake as a shaking or trembling of the earth that includes volcanic, tectonic, or volcanic origin.
• Explains the four layers of the earth: crust, mantle, inner core, and the outer core. tectonic plates move in a constant motion, driving them into each other.

• Explains that powerful forces of nature can cause destruction to lives and property. while earthquakes and volcanoes help us determine and better understand their powers, they are natural phenomena that we need to learn even more about.
• Explains merriam webster defines an earthquake as a shaking or trembling of the earth that includes volcanic, tectonic, or volcanic origin.
• Explains the four layers of the earth: crust, mantle, inner core, and the outer core. tectonic plates move in a constant motion, driving them into each other.
• Describes how scientists record earthquakes with seismographs, which have a base that sits firmly on the ground, and heavy weights that hang from strings. scientists measure the distance between the up and down in the graph.
• Explains that scientists use a tool called the richter magnitude scale to measure earthquakes. the scale records the amplitude of the waves recorded by the seismograph.
• Explains that the biggest earthquake ever recorded landed a 9.5 on the richter scale in chili in the year 1960. earthquakes on one side of the earth can shake the opposite side
• Defines volcanoes as a vent in the crust of the earth from which molten or hot rock and steam issue.
• Explains that volcanoes are classified as active, dormant, or extinct according to scientists.
• Explains that eruptions happen through fault lines when pressure in the mantle builds so strong it can collapse. magma gushes through the spaces and turns into lava when it reaches the earth’s surface.
• Describes the volcanic explosivity index, a tool made by chris newhall of the united states geological survey and stephen self at the university of hawaii in 1982.
• Explains that volcanoes are destructive and cause harm to many people and towns. lava moves fast and in any direction until it cools off and then turns back into rock.
• Explains that shield volcanoes have very fluid lava, usually from multiple vents or fractures, spreading over very large areas. mount kilauea and maunaloa in hawaii define good examples.
• Explains that lava domes produce from eruptions with less viscous lava. they don't spread all over because of this.
• Explains that cinder cones are the most common volcano, and their height depends on how long the eruption takes and how much lava comes out. paricutin volcano in mexico is an example.
• Explains that composite volcanoes rise up to about 8,000 feet. they are ash, rock, dust, and lava-covered mountains with steep slopes.
• Describes vulcanian, vesuvian, and peléan eruptions.
• Explains that earthquakes and volcanoes can be destructive and dangerous natural disasters. scientists find it easier to predict a volcano than an earthquake.
• Explains that earthquakes and volcanoes are dangerous because they burst out hot lava, and if people are not prepared, they will get burned and die.