Which of these is most responsible for the motion of the tectonic plates that make up Earth's crust? Select one:

Temperature differences in Earth’s inner core.

Light from the sun.

Temperature differences in Earth’s mantle.

Light from the moon.

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

What term is given to the border between the central alps and the southern limestone alps?

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed