If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.  Will adds salt to the pot of water. The water's volume is now less dense or denser?
denser

More UV rays increase skin cancer rates.  If you spend a lot of time out in the sun then getting skin cancer is less likely or more likely?
more likely

An object has greater momentum if it has greater mass, greater velocity, or both.  A larger boulder will roll down a hill faster or slower than a smaller one?
faster

When there are more sunspots the Sun is more active and there are more solar storms and more of the Sun's energy reaches the Earth.  When astronomers noticed a doubling of Sun spot activity, did they predict that the Earth's temperature would increase or decrease??
increase