Volcanoes change the earth by

a. slowly seeping and flowing over time
b. slowly heating the surface
c. rapidly using up the oxygen
d. keeping mountains from growing

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils