a boy throws a ball 1 meter into the air. at the highest point in the air the ball has a gravitational potential energy of 20 J. how much potential energy would it have if the boy threw it 2 meters into the air?

Several processes form metal ore. match each process to its description. volcanic activity weathering hydrothermal energy rocks break down as they interact with air and water. arrowright density differences and other factors cause metals to concentrate in igneous rocks. arrowright seawater heats up from contact with hot rock, and metals dissolve in it. the water rises and contacts cooler water, causing metal ores to settle on the ocean floor. arrowright

When an object is heated it contracts. a. true b. false

What was the first instrument to ever record an earthquake?