At zero degrees of latitude is the:
equator
international date line
prime meridian
arctic circle

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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

What type of coastline is commonly found along the western side of the america’s