Which choice below correctly completes the sentence?

reaches the Earth's surface through , then turns into .

A. Lava; volcanoes; magma
B. Lava; earthquakes; magma
C. magma; volcanoes; lava
D. Magma; earthquakes; lava

When the pressure that a gas exerts

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

The fact that the total amount of energy in a system remains constant is a(n)