1.1 formation of rocks Flashcards

1
Q

How are igneous rocks formed?

A

magma cools down to form igneous rocks

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2
Q

cooled magma forms

A

intrusive rocks

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3
Q

cooled lava forms

A

extrusive rocks

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4
Q

examples of igneous rocks (2)

A
  • Granite
  • Basalt
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5
Q

when magma cools down faster on the surface ____ crystals are formed

A

tiny crystals

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6
Q

when magma cools down slowly beneath the crust surface _____ crystals are formed

A

large

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7
Q

How are sedimentary rocks formed?

A
  • Small rock particles go through erosion and weathering and accumulate at the seabed.
  • Over time layers of sediments are formed and then they go through compaction and cementation to form sedimentary rocks
  • Crystals absent
  • only rock where fossils are found
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8
Q

why do sedimentary rocks contain fossils?

A

The fossils can get compacted and cemented underwater

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9
Q

Examples of sedimentary rocks (3)

A
  • LImestone
  • Sandstone
  • Shale
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10
Q

How are metamorphic rocks formed?

A
  • Formed from the existing rock when heat and/or pressure causes changes in the rock without melting it.
  • crystals could be present
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11
Q

Examples of metamorphic rocks (2)

A
  • Marble
  • Slate
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