Pick the correct word to fill up the blank in below question: magnetic field, atmospheric layers, gravitational pull, attraction force.
A rocket ship going from Earth to the moon must leave the___ ___ of Earth due to its mass.
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Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Contrast the force of gravity between these pairs of objects: 1-kg mass and a 2-kg mass that are 1 m apart; a 1-kg mass and a 2-kg mass that are 2 m apart; and two 2=kg masses that are 1 m apart. i dont understand.

Match the lithification processes. 1. contact pressure causing grains to "grow" together 2. increase in density due to weight of overburden 3. precipitation of bonding agents between grains a. recrystallization b. cementation c. compaction