Why is air pressure greatest at the earth’s surface?
because of the pressure of oxygen
because of the weight of ice crystals
because gravity pulls gas molecules toward the surface
because of pollution

Gymnast always perform on padded mats. how does the mats protect the gymnast

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?