Extrusive igneous rocks are formed above ground, but can sometimes found underground because...

Rocks formed at the surface can sink below the surface due to Earth's movements. Sedimentation can bury rocks that formed at the surface.

Rocks formed deep underground can be moved to the surface due to Earth's movements. Sedimentation can bury rocks that formed at the surface.

Rocks formed at the surface can sink below the surface due to Earth's movements. Weathering also exposes rocks that were once buried deeply.

Rocks formed deep underground can be moved to the surface due to Earth's movements. Weathering also exposes rocks that were once buried deeply.

Intrusive igneous rocks are formed underground, but can sometimes found above ground because...

Rocks formed deep underground can be moved to the surface due to Earth's movements. Weathering also exposes rocks that were once buried deeply.

Rocks formed deep underground can be moved to the surface due to Earth's movements. Sedimentation can bury rocks that formed at the surface.

Rocks formed at the surface can sink below the surface due to Earth's movements. Weathering also exposes rocks that were once buried deeply.

Rocks formed at the surface can sink below the surface due to Earth's movements. Sedimentation can bury rocks that formed at the surface.

Pumice forms when gassy lava erupts out of a volcano. Why does pumice not have any visible crystals, and air pockets?

It cools quickly, trapping gas as air pockets, and the minerals cannot move to a crystal that is forming

It cools slowly, trapping gas as air pockets, and the minerals cannot move to a crystal that is forming

It cools quickly, releasing gas as air pockets, and the minerals move to a crystal that is forming

It cools slowly, trapping gas as air pockets, and the minerals move to a crystal that is forming

A geologist removed some rock from the edge of an old lava flow. No crystals could be seen when the rock was studied under a microscope. The rock was a dark colour and was hard, but very brittle. It was easily broken into pieces by hitting it, and broke into very sharp, thin strips, which were very lustrous (shiny). Why are there no crystals, even though it is an igneous rock?

It is an extrusive igneous rock, meaning it cooled too fast for crystals to form

It is an extrusive igneous rock, meaning it cooled too slowly for crystals to form

It is an intrusive igneous rock, meaning it cooled too fast for crystals to form

It is an intrusive igneous rock, meaning it cooled too slowly for crystals to form

Dolerite and basalt are chemically very similar rocks, and both are igneous rocks. Dolerite is an intrusive igneous rock, whereas basalt is an extrusive igneous rock. Would there be any difference between the two rocks?

Dolerite would have larger crystals than basalt.

Dolerite would have smaller crystals than basalt.

Porphyry is an igneous rock that has a mixture of crystal sizes. IT has large crystals set in a rock of finer grains. Geologists have suggested that porphyry forms in two stages. How do you think this type of rock is likely formed?

Porphyry may be formed when magma slowly cools deep below ground, and large crystals start to form. Then more magma rapidly pushes this cooling mass up to the surface without the large crystals melting. The magma then cools faster, forming smaller crystals in-between the large crystals.

Porphyry may be formed when magma quickly cools deep below ground, and large crystals start to form. Then more magma rapidly pushes this cooling mass up to the surface without the large crystals melting. The magma then cools slower, forming smaller crystals in-between the large crystals.

Porphyry may be formed when magma quickly cools deep below ground, and large crystals start to form. Then more magma rapidly pushes this cooling mass up to the surface without the large crystals melting. The magma then cools faster, forming smaller crystals in-between the large crystals.

Porphyry may be formed when magma slowly cools deep below ground, and large crystals start to form. Then more magma rapidly pushes this cooling mass up to the surface without the large crystals melting. The magma then cools slower, forming smaller crystals in-between the large crystals.

Pearson 8.2 Review Questions

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Hard

Natalie MCCONNELL

Used 20+ times

FREE Resource

28 questions

Show all answers

1.

FILL IN THE BLANK QUESTION

1 min • 1 pt

______ is molten rock that does not reach the Earth’s surface

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

___________ igneous rocks: igneous rocks that form below the surface of the Earth

3.

FILL IN THE BLANK QUESTION

1 min • 1 pt

__________ is molten rock that erupts from a volcano

4.

FILL IN THE BLANK QUESTION

1 min • 1 pt

__________ igneous rocks: igneous rock that cools and solidifies above the Earth's surface

5.

MULTIPLE SELECT QUESTION

45 sec • 1 pt

What do the following rocks have in common: basalt, pumice, scoria, obsidian

They're all extrusive igneous rocks

They're all intrusive igneous rocks

6.

MULTIPLE SELECT QUESTION

45 sec • 1 pt

What do the following rocks have in common: Granite and dolerite

They're all extrusive igneous rocks

They're all intrusive igneous rocks

7.

MULTIPLE SELECT QUESTION

45 sec • 1 pt

What are the 3 minerals in granite?

Halite

Quartz

Gypsum

Feldspar

Biotite

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Pearson 8.2 Review Questions

28 questions

______ is molten rock that does not reach the Earth’s surface

___________ igneous rocks: igneous rocks that form below the surface of the Earth

__________ is molten rock that erupts from a volcano

__________ igneous rocks: igneous rock that cools and solidifies above the Earth's surface

What do the following rocks have in common: basalt, pumice, scoria, obsidian

What do the following rocks have in common: Granite and dolerite

What are the 3 minerals in granite?

What features are used to classify igneous rocks?

Extrusive igneous rocks are formed above ground, but can sometimes found underground because...

Intrusive igneous rocks are formed underground, but can sometimes found above ground because...

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