Quiz about Pearson 8.2 Review Questions

Question 1

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

Accepted Answer

They're all extrusive igneous rocks

Answer

They're all intrusive igneous rocks

Question 2

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

Accepted Answer

They're all intrusive igneous rocks

Answer

They're all extrusive igneous rocks

Question 3

What are the 3 minerals in granite?

Accepted Answer

Quartz

Accepted Answer

Feldspar

Accepted Answer

Biotite

Answer

Halite

Answer

Gypsum

Question 4

What features are used to classify igneous rocks?

Accepted Answer

Texture

Accepted Answer

Colour

Answer

Shape

Answer

Smell

Answer

Weight

Question 5

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 6

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 7

This rock would have cooled (quickly/slowly), (above/below) the surface.

Accepted Answer

slowly, below

Answer

quickly, above

Answer

quickly, below

Answer

slowly, above

Question 8

This rock would have cooled (quickly/slowly), (above/below) the surface.

Accepted Answer

quickly, above

Answer

quickly, below

Answer

slowly, above

Answer

slowly, below

Question 9

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 10

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 11

Which of the following features apply to RHYOLITE?

Accepted Answer

Small crystals

Accepted Answer

Light colour

Answer

Dark colour

Answer

Large Crystals

Answer

Holes

Question 12

Which of the following features apply to BASALT?

Accepted Answer

Small crystals

Accepted Answer

Dark colour

Answer

Light colour

Answer

Large Crystals

Answer

Holes

Question 13

Which of the following features apply to GRANITE?

Accepted Answer

Large Crystals

Accepted Answer

Light colour

Answer

Dark colour

Answer

Small crystals

Answer

Holes

Question 14

Which of the following features apply to GABBRO?

Accepted Answer

Large Crystals

Accepted Answer

Dark colour

Answer

Light colour

Answer

Small crystals

Answer

Holes

Question 15

Which of the following features apply to PUMICE?

Accepted Answer

Holes

Accepted Answer

Light colour

Answer

Dark colour

Answer

Glassy

Answer

Large Crystals

Question 16

Which of the following features apply to SCORIA?

Accepted Answer

Holes

Accepted Answer

Dark colour

Answer

Light colour

Answer

Glassy

Answer

Large Crystals

Question 17

Which of the following features apply to OBSIDIAN?

Accepted Answer

Dark colour

Accepted Answer

Glassy

Answer

Light colour

Answer

Large Crystals

Answer

Holes

Question 18

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?

Accepted Answer

Dolerite would have larger crystals than basalt.

Answer

Dolerite would have smaller crystals than basalt.

Answer

There would be no difference.

Question 19

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?

Accepted Answer

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.

Answer

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.

Answer

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.

Answer

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

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