In terms of action potential initiation, the intake of ___ causes more voltage gated ion channels to ___ down the lin -Na2+, open
-Ca2+, open
-Na2+, close
-Mg2+, open

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