Extrusive igneous rock forms beneath the earth's crust usually cools very slowlyb forms on the earth's crust has large mineral crystals

--forms on the earth's crust--

Explanation:

It can't be cools slowly because in the reading (on my assignment) it kept on stating that the extrusive igneous rock cool very quickly, so it cant be cools slowly...

Next we have Forms beneath the earths crust, I don't have much info on this one but I know for a fact that the extrusive igneous rock forms as soon as the volcano explodes its lava out then it quickly cool, So I'm guessing that its not this one either.

Next we have- forms on the earth's crust, Since a volcano is on the crust of the earth that means that the rock would be too! Since the rock can only be formed (I don't think that is a word lol) right as soon as the magma becomes lava then the rock cools and then becomes an extrusive igneous rock-

Last we have - Has large crystals, This is not possible since the rock cools extremely fast it does not have the time for bigger crystals to form, if that makes sense lol. therefore this cannot be the answer..

After all this we finally have our answer GOOD LUCK!! and yes this question was posted 2 years ago- lol

Explanation:

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

i think its white blood cells

i hope this