priciple that states that geologic change occurs suddenly

geologic principle that states that in horizontal layers of sedementary rock,each layer is older than the layer above it and younger than the layer below it

princple that states that geologic process that occuredin the past can be explianed by current geologic processes. the present is the key to the past

a unit of geologic time that includes two or more periods .

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paleontolgy

Question	Answer
catastrophism	priciple that states that geologic change occurs suddenly
law of superposition	geologic principle that states that in horizontal layers of sedementary rock,each layer is older than the layer above it and younger than the layer below it
uniformitarinism	princple that states that geologic process that occuredin the past can be explianed by current geologic processes. the present is the key to the past
era	a unit of geologic time that includes two or more periods .