The stars generate helium from hydrogen at core temperatures of about 10 million degrees. why does it require even higher temperatures to create elements with greater numbers of protons than helium?

Which activates a convection current, starting the flow of a fluid? A. Cold temperatures at the North Pole B. Heated liquids at earth's surface C. iron-rich rocks in the mantle D. temperature differences in the mantle

Why can the moon eclipse the sun on occasion A. sometimes they line up in a straight line B. the moon appears about the same size as the sun C. the moon and sun both have an angular diameter of 1/2 degree D.

Where is the Red square located? Beijing, Moscow, or Shanghai?

What does John Green address that Diamond left out about development and civilization?

Which planet's water resources (solid, gas, or liquid) might be close to the amount on earth?

Which two lines of longitude run through southern Florida?

Consider you own geography. What are at least two possible natural disaters that are likely to occur? Make a list of essential items you and your family should stockpile in advance.

Why can rapid population growth rate be a problem for a nation?

Why did music suck in the 2010's?

The printing press did not affect the spread of the Renaissance. True False