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Igneous Rocks

Test Description: Igneous Rocks

Instructions: Answer all questions to get your test result.

1) Which type of rock is heated enough to melt and eventually cools?

ASedimentary BMetamorphic CIgneous

2) What are intrusive igneous rocks?

AIgneous rocks that stay as magma and cools underground BIgneous rocks that come out as lava and cools ON the Earth's surface

3) What are extrusive igneous rocks?

AIgneous rocks that come out as lava and cools ON the Earth's surface BIgneous rocks that stay as magma and cools underground

4) Example of extrusive rock is...

AShale BObsidian CSandstone DGranite

5) Example of intrusive rock is...

AQuartz BObsidian CGranite DSandstone

6) What determines an igneous rock's texture?

ASpeed of cooling BSpeed of melting CSpeed of erosion DSpeed of cracking

7) What happens when magma/lava cools slowly?

ACrystals have less time to grow, meaning less crystals BCrystals have more time to grow, meaning more crystals CCrystals grow and fall off, meaning no crystals DCrystals do not grow, meaning no crystals

8) What happens when magma/lava cools quickly?

ACrystals do not grow, meaning no crystals BCrystals grow and fall off, meaning no crystals CCrystals have more time to grow, meaning more crystals DCrystals have less time to grow, meaning less crystals

9) Which texture is formed when lava/magma cools slowly?

ACoarse-grained texture BFine-grained texture

10) Which texture is formed when lava/magma cools quickly?

AFine-grained texture BCoarse-grained texture

11) Can intrusive igneous rocks only be found by digging?

AYes, they are made above ground BNo, they can also be found by erosion/weathering CYes, they can only be found underground DNo, they can only be found underground

*select an answer for all questions

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