The mantle is:

The inner core is:

What is the theory called in which the continents move over millions of years?

The wearing away and removing of rock materials is called:

Why would we plant grass in yards and along highways?

An insecticide is something that kills insects. What would an ideal (the perfect) insecticide do?

cutting down rain forests around the world has many major effects on the environment. which of the statements below is not one of these effects?

What is the area of earth called where there are over 1500 volcanoes?

What is a person who studies rocks called?

Who studies fossils?

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