Pressure at the center of the earth is times greater than the surface of the Earth. A) two B) 100 C) 2 thousand D) 3.6 million

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Drug abuse will not lead to physical and psychological dependence. true or false ?