9.3 Hot Rocks Flashcards

1
Q

rocks that form from the cooling of lava or magma as it is thrown through the air from a volcanic eruption

A

igneous rocks

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2
Q

igneous rock that forms when lava cools above the Earth’s surface

A

Extrusive Rocks

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3
Q

a pale rock that forms when frothy lava cools in the air. Pumice often floats on water as it is very light and full of holes that once contained gas.

A

Pumice

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4
Q

a dark, igneous rock formed from gassy lava that cools quickly

A

Scoria

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5
Q

a property of a material or substance that easily scratches another

A

Abrasive

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6
Q

a dark, igneous rock with small crystals formed by fast cooling of hot lava. It sometimes has holes that once contained volcanic gases.

A

Basalt

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7
Q

a black, glassy rock that breaks into pieces with smooth shell-like surfaces

A

Obsidian

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8
Q

igneous rock that forms when magma cools below the Earth’s surface

A

intrusive rocks

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9
Q

intrusive rock mass that measures more than 100 kilometres across

A

Batholiths

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10
Q

a hard, igneous rock with different-coloured crystals large enough to see. It forms slowly below the Earth’s surface.

A

Granite

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