What type of rock is formed by cooling magma or lava?

The african continent is home of the worlds largest desert and longest river . t or f

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?

In which horizon of soil profile is prevent material usually found