An animal burrows through a rock, causing it to break. this is an example of
erosion
mass wasting
animal weathering
biological weathering

On this graph, the top horizontal line represents a price floor set above equilibrium. a price floor set below equilibrium. a price ceiling set above equilibrium. a price ceiling set below equilibrium.

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Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite