Which statement about the greenhouse effect is not true? .

a.) the greenhouse effect keeps earth from becoming too hot during the day.
b.) the greenhouse effect causes the change in seasons.
c.) the greenhouse effect keeps earth from becoming too cold during the night.
d.) the greenhouse effect makes it possible for organisms to live on earth.
e.) the greenhouse effect can be influenced by human activity.

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of