What do we call magma that reaches the Earth's surface? A) Hot rock
B) Magma
C) Lava
D) Mantle

Magma that reaches the earths' surface is called Lava.

Explanation:

I have no idea what hot rock is, but I know it's not that.

It's not magma, because that is what unsurfaced lava is called.

Lava is the answer, it's surfaced magma.

The mantle is the layer underneath the crust of the earth that is made up of magma. It's where all the magma comes from.

I hope this helps, mark brainliest if it did, maybe? :)