C2-Chemical resources Flashcards

1
Q

What is the outer layer of the earth called

A

Lithosphere

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2
Q

What is the lithosphere made of

A

Tectonic plates

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3
Q

tectonic plates are ………… dense than the mantle below

A

less

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4
Q

How is most of the information about the earth collected

A

Seismic waves produced by man made explosions and volcanoes

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5
Q

State two properties of the mantle

A

Cold and rigid

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6
Q

Where is the mantle located

A

between the core and the crust

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7
Q

Why does the temperature of mantle increase with depth

A

Because the earth core transfers energy

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8
Q

What makes the plates slowly move

A

convection currents

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9
Q

Oceanic crust is …………… than continental crust

A

denser

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10
Q

How are volcanoes formed

A

magma rises through the earth’s crust because it is less dense than the crust this can cause volcanoes

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11
Q

Different types of …………….rock are formed from lava

A

igneous

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12
Q

Basalt rock forms from

A

Runny lava slower eruptions

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13
Q

rhyolite rock forms from

A

thick lava in explosive eruptions

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14
Q

Limes stone is a ………………. rock

A

sedimentary

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15
Q

How is limestone formed

A

soft sediments compressed and cemented together

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16
Q

Marble is an example of a

A

metamorphic rock

17
Q

Marble is formed when limestone is

A

changed by heat and pressure and is typically composed of an interlocking mosaic of carbonate crystals

18
Q

How is granite formed and what type of rock is it

A

when magma cools and solidifies It is a igneous rock so it is very hard

19
Q

What is thermal decompostion

A

A reaction where one substance breaks down on heating to give at least two new substances