Which of the following is an example of acceleration? A) Standing in position while waiting to begin jumping jacks.

B) A leaf blown from a tree by the wind.

C) Gravity holding a rock still on the ground.

D) Slowing a bike by applying the brakes.

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

Which two objects have the greatest gravitational force acting between them

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more