Classify each planet as an inner planet or an outer planet.
over the last 250 million years, the world changed from a single land mass to a number of different continents. one reason for the change is expanding ocean floors. what causes ocean floors to expand?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .