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8th Grade > Earth Science- Rocks > Flashcards

Earth Science- Rocks Flashcards

1
Q

What is an Extrusive Rock?

A

they cool fast

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2
Q

What is the most common intrusive rock? Where can it be found?

A

Granite and mountain ranges

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3
Q

What is the most common extrusive rock? What is it mostly made out of?

A

Basalt and the earths crust

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4
Q

What is a porphyritic texture?

A

Larger crystals scattered on a background of much smaller crystals,

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5
Q

What type of rocks do intrusive rocks have?

A

Large crystals

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6
Q

What type of crystals do extrusive rocks have?

A

Smaller crystals

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7
Q

What does low silica indicate?

A

dark colored rocks

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8
Q

What does high silica indicate?

A

light colored rocks

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9
Q

What igneous rock is considered volcanic glass?

A

Obsidian

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10
Q

What igneous rock is used for cleaning and exfoliating your feet?

A

Pumice

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11
Q

Do igneous rocks react with acid?

A

no

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12
Q

Order that forms sedimentary rocks

A

Erosion
Deposition
Compaction
Cementation

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13
Q

What is erosion

A

when forces are constantly breaking up and wearing away rocks

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14
Q

What is deposition?

A

when sediment settles out of water or wind carrying it

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15
Q

What is compaction?

A

The process that presses sediments together.

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16
Q

What is Cementation?

A

When minerals in the rocks slowly dissolve in the water

17
Q

What are the 3 groups of sedimentary rocks?

A

Clastic
Organic
Chemical

18
Q

What are the two types of Igneous rocks?

A

Intrusive

extrusive

19
Q

What is an intrusive rock?

A

They cool slowly

20
Q

What is a clastic sedimentary rocks?

A

Rocks that form when rock fragments are squeezed together

21
Q

What is an organic Sedimentary rock?

A

forms where remains of plants and animals are deposited in thick layers

22
Q

What is a chemical sedimentary rock?

A

Forms when minerals are dissolved in a solution crystallize

23
Q

What is coal formed from?

A

Swamp plants buried in water

24
Q

Where do metamorphic rocks form?

A

under the earths surface

25
Q

What rocks can form from metamorphic rocks?

A

Igneous
Sedimentary
other metamorphic rocks

26
Q

What are non foliated rocks?

A

Minerals in a rock that are arranged randomly

27
Q

What was foliated rocks?

A

Grains arranged in parallel layers or bands

28
Q

Examples of Foliated rocks

A

Shale and slate

29
Q

Examples of non foliated rocks

30
Q

2 Key factors that are needed to form Metamorphic Rocks

A

Heat

pressure

31
Q

What are the parent rocks of slate?

32
Q

What is the parent rock of Marble?

33
Q

What is the parent rocks of quartzite?

34
Q

What is an igneous rocks formed from?

A

Lava that erupted onto the earths surface

35
Q

How are sedimentary rocks former?

A

By particles deposited by water and wind

8th Grade (6 decks)

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