new notes Flashcards

1
Q

What is radioactive dating?

A

Radioactive dating is a method of dating rocks and minerals using radioactive isotopes

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2
Q

what is the law of superposition

A

In any undisturbed sequence of strata, the oldest layer is at the bottom and the youngest is at the top

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3
Q

What is the cross-cutting law

A

Any feature that cuts across a body of sediment or is younger than the rock it cuts across

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4
Q

what is the law of inclusions?

A

One rock body contains fragments of another rock body it must be younger than the fragments of rock

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5
Q

what are the main processes of sedimentary rocks

A

Weathering and erosion and deposition

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6
Q

what is the difference between rocks and minerals ?

A

A mineral is made up of a substance that under normal circumstances would form crystals. Rocks are made up of minerals.

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7
Q

difference of mafic and felsic minerals

A

Mafic: Iron and magnesium dark coloured
Felsic: Oxygen, aluminium, slicon, potassium and sodium light coloured

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8
Q

how is soiled formed

A

weathering of rock plants can physically and chemically weather rock

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9
Q

factors that affect the soil formation

A

Parent material
Climate
Life
Topography
Time

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