Earth's Layers, Plates, Volcanoes, and Earthquakes

One feature of a divergent boundary.

• seafloor spreading

• mountain chains

• earthquakes

What happens when two plates move apart?

• a new plate from underneath fills in the gap created by the plates moving apart

• sand and dirt fill in the gap created by the plates moving apart

• water fills in the gap created by the plates moving apart

• soft, solid rock from underneath the plates rises up and hardens, adding solid rock to the edges of both plates.

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What happens when two plates are moving toward each other?

• The plates hit each other and break into pieces making sand.

• One plate goes underneath the other plate into the soft rock below.

• The plates push against each other, making the edges bend upward.

• One plate goes underneath the other plate into the ocean below.

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Which terms describe this plate boundary?

• divergent

• convergent

• mid ocean ridge

• trench

• rising

What is true about the Earth's outer layer?

• it is made of hard, solid rock

• it is made of soft, solid rock

• it is broken in plates

• it is broken in mantle

• it is moving at a slow rate

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Earth's plates are moving at an average rate of

• 10 cm per year

• 1 kilometer per year

• 3 kilometers per year

• 3 cm per year

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What is the effect of plates moving?

• volcanoes

• earthquakes

• tornadoes

• both volcanoes and earthquakes

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What is Earth's outer layer underneath the surface in the image?

• sand and water

• hard solid rock

• sand

• water

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The Lystrosaurus fossils can be found in India and South America, which are parts of different plates. This is a land animal that can not swim. What could explain how these fossils got so far apart?

• The plates slowly moved apart as soft solid rock from underneath got added to the edges of the plates over millions of years.

• The plates floated away from each other.

• The plates slowly moved apart as new plates from underneath got added between them over millions of years.

• The plates were sometimes pushed far apart by earthquakes and soft solid rock from underneath got added to the edges of the plates.

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Where will geologists find hard, solid rock?

• neither under continents or oceans, because there is sand and water under both.

• neither under continents or oceans, because there is water under both places.

• only under the continents, but not under the oceans.

• under both continents and oceans, because Earth's outer layer is made of hard, solid rock.