Gross domestic product (GDP) is the value of goods and services produced in a country annually.

Who developed the theory of plate tectonics?

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.

What does the plate tectonic theroy describe?