Which of Earth's layers is comprised mainly of extremely hot liquid metals?

crust

mantle

outer core

inner core

The elderly population in the US is expected to increase substantially over the next twenty years. Which of the following best explains this population increase?

When an air parcel with 50% relative humidity is descending in the atmosphere within an area of high pressure, its relative humidity is A) decreasing B) staying the same C) increasing

Describe how one technological advance caused scientists to view earth as a system rather than individual parts.

What are environmental impact statements?

How long did it take for the grand canyon to form?

Which of the following is an accomplishment of the Zhou dynasty? A. They conquered the Huns in the north. B. They developed a writing system. C. They established a system of money. D. They established the practice of ancestor worship.

What does the Bible refer to Cyrus as?

Which is the second tallest mountain in the world? and tell me it's height.

Name two great mountain chains one in the western United States and one of the eastern United States

Where do we find natural gas in an oil well?