Law of Superposition

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What is the Law of Superposition?

Back

The Law of Superposition states that in any undisturbed sequence of rocks, the oldest layers are at the bottom and the youngest layers are at the top.

Front

Which layer is the youngest according to the Law of Superposition?

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The youngest layer is the one at the top of the sequence.

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What does relative age of a rock mean?

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The relative age of a rock is determined by its position in relation to other rocks and fossils around it.

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Where are the oldest fossils typically found?

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The oldest fossils are typically found near the bottom of rock layers.

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What evidence do glacier scars provide about Africa's past climate?

Back

Glacier scars indicate that Africa was once in an area of the Earth that had a very cold climate.

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What is a sedimentary rock?

Back

Sedimentary rock is formed by the accumulation and compaction of mineral and organic particles.

Front

What is the significance of the Law of Superposition in geology?

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It helps geologists determine the relative ages of rock layers and the fossils within them.

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What is an igneous rock?

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Igneous rock is formed from the cooling and solidification of molten rock (magma or lava).

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How can scientists determine the relative age of rock layers?

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Scientists can determine the relative age of rock layers by examining their position and the fossils they contain.

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What is the principle of original horizontality?

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The principle of original horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.