What normally describes what happens when you decrease the temperature of water?
A) The molecules start to vibrate and move farther apart, increasing the density.
B) The molecules start to vibrate and move closer together, increasing the density.
C) The molecular vibrations start to slow and the molecules move farther apart, decreasing the density.
D) The molecular vibrations start to slow and the molecules move closer together, increasing the density.
E) none of the above
Question 2
Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.
A) The neutron is nearly massless.
B) The neutron is only slightly more massive than the proton.
C) The discovery required the use of ultrafast computers.
D) The neutron lacks an electrical charge.
Evidence of Water on Mars
Annual Water Use in the United States
The movement of water vapor molecules exerts vapor pressure on surfaces.
Diversion of surface water
Running Water
A melting profile shows the increase in UV absorption versus temperature