Mechanical weathering does not change
a. the size of the rock
b. the chemical composition of
c. the rock the shape of the rock
d. the original weight of a rock

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5