6.E.2 Unit Quiz

The diagram shows the composition of the surface of Earth. Which best summarizes the composition of the surface of Earth?

• Three-fourths of Earth’s surface is land.

• One-fourth of Earth’s surface is water.

• Earth’s surface contains more land than water.

• Earth’s surface contains more water than land.

The diagram shows the layers of Earth’s interior. Which layer is most observed and studied by scientists?

• crust

• mantle

• inner core

• outer core

The diagram shows the layers of Earth. Which part of the diagram represents the mantle?

• 1

• 2

• 3

• 4

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Which feature would most likely indicate that two of Earth’s plates are diverging?

• a plain

• a plateau

• a rift valley

• a mountain range

Which causes movements of Earth’s tectonic plates?

• convection currents

• magnetic core

• wind blowing

• ocean waves

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How are primary and secondary earthquake waves similar?

• Both can travel through solid rock.

• Both travel at the same speed.

• Both can travel through liquid.

• Both travel through the air.

How is new crustal material continuously added to the ocean floor?

• by decreasing the salt content in the ocean

• by seafloor spreading at the mid-ocean ridge

• by subducting crustal plates at an ocean trench

• by increasing the amount of oceanfront erosion

Look at the diagram of a cross section of Earth. How does this diagram help to confirm Alfred Wegener’s hypothesis of continental drift?

• It shows that Earth’s mantle has several concentric layers.

• It demonstrates that Earth’s crust is the thinnest of Earth’s layers.

• It illustrates how crustal plates float on convection currents in Earth’s mantle.

• It models how Earth’s core is subdivided into an inner core and an outer core.

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Which processes most contribute to soil formation?

• heating and cooling

• melting and pressure

• weathering and erosion

• compaction and cementation

Which is the starting material of soil?

• organic matter

• parent rock

• debris

• silt