A 77.2 kg soccer player is running at 8 m/s. What is his momentum in kg⋅m/s?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

What causes the formation of ocean currents?

By what primary heat transfer mechanism does the sun warm the earth?