What causes changes in weather?
a.
air masses move and meet.
b.
water evaporates.
c.
the air gets more humid.
d.
clouds form.

What happens to atoms and chemical bonds during a reaction?

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.