Explain valley?
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Define the cambrian?
Explain how can we calculate or estimate the evaporation from lakes?
What is the earths crust made of?
Explain how were sedimentary rocks created?
How old is the earth?
What is inorganic matter?
How do you calculate the age of earth?
What is gneiss?
Explain when does an atoll start to form?
What is granite?
Define granite?
What is lithosphere?