Unit 2.2 Geologic Processes

Which of the following statements best describes the outer core?

• It is the outermost layer of Earth, made of solid rock.

• It is the liquid inner layer of Earth, made of metals at extremely high temperatures.

• It is the solid inner layer of Earth, made of metals at extremely high temperatures.

• It is the middle layer of Earth, made of rock which varies in temperature and thickness.

Two students are discussing the processes that form the different rocks near mountains and lakes. Which choice below compares the formation of rocks at these locations?

• Mountains push weathered rocks underneath tectonic plates to form sedimentary rocks inside the mantle. Rivers erode igneous rocks over time to form metamorphic rock.

• Sedimentary rock is formed from the heat and pressure in between tectonic plates to form mountains. Rivers deliver weathered rock to lake beds and form igneous rock over long periods of time.

• Metamorphic rock is formed by heat and pressure of tectonic plates is then pushed up to form mountains. Rivers deliver weathered rocks into lake beds forming sedimentary rock as more layers are added.

• Igneous rock is formed by volcanoes releasing magma from the mantle, the rock cools and piles up forming a mountain. Rivers direct water to cool magma underground forming metamorphic rock under lake beds.

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California sits at the border between two major tectonic plates: • Pacific plate, moving northwest, • North American plate, moving southeast. Each year the California area has about 10,000 earthquakes. Which of the following describes why earthquakes are a common occurrence in California?

• The two plates form a transform boundary because earthquakes are caused by plates sliding past each other.

• The two plates form a convergent boundary because earthquakes are caused by plates sliding past each other.

• The two plates form a transform boundary because earthquakes are caused by the Pacific plate subducting under the North American plate.

• The two plates form a convergent boundary because earthquakes are caused by the Pacific plate subducting under the North American plate.

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Which of Earth's layers would be described as being rocky and having the lowest density?

• crust

• mantle

• inner core

• outer core

The Andes Mountains are the world's longest range of mountains and runs north to south along the Pacific Ring of Fire. It is known for its several volcanoes including the world’s highest active volcano, Nevados Ojos del Salado. How are volcanoes like this formed?

• Divergent plate boundaries cause mountains to separate, leaving room for the convecting magma below to enter.

• Divergent plate boundaries cause plates to collide, causing subduction where convection in the mantle forces magma to the surface.

• Convergent plate boundaries carve out an opening at the top of the mountains, which allows convecting magma in the ground to rise.

• Convergent plate boundaries cause plates to collide. Oftentimes, this collision forces the denser plate to subduct while convection in the mantle forces magma to the surface.

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Which option describes how heat and the movement of Earth's tectonic plates contribute to the formation of an ocean basin?

• Heat from the mantle conducts through tectonic plates causing them to melt.

• Heat from the mantle forms convection currents causing the plates to transform.

• Heat from the mantle forms convection currents causing the tectonic plates to diverge.

• Heat from the mantle conducts through the tectonic plates causing the plates to converge.

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Heat generated by the core is passed to the mantle by conduction. Which option below best describes how the flow of heat through the mantle affects the movement of the Earth's tectonic plates?

• Heated material in the mantle rises towards the crust through convection which causes plate motion.

• Heat conducted from the Earth's mantle moves tectonic plates due to the gravitational pull from the Earth's core.

• Heat is transferred from the mantle to the crust by radiation, which then causes the plates to move on the surface.

• Heated material in the mantle rises to the surface by radiation, which causes the crust to harden and move the plates.

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Alisha's science teacher asked each student to create a model of the Earth's tectonic plates. Alisha decided to use a hard-boiled egg, like the one pictured below. Part of the assignment required her to describe the benefit of the model they chose. Which description below accurately describes the benefit of her model?

• The egg white under the shell represents the mantle.

• The shape of the egg matches the shape of the Earth.

• The cracks on the shell represent the tectonic plate boundaries.

• The eggshell “plates” are able to move like the Earth’s tectonic plates.

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The map below shows some of Earth’s plate tectonic boundaries. Based on the map, volcanic activity would most likely be found at which location?

• Location W

• Location X

• Location Y

• Location Z

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Which type of plate movement will result in a volcano forming at a subduction zone?

• When two continental plates collide.

• When two continental plates move apart.

• When an oceanic and a continental plate collide.

• When an oceanic and a continental plate move apart.