Why do magmas rise toward earth's surface? magmas are mainly liquid and contain dissolved fluids such as water; most are less dense than the adjacent solid rock. most magmas are richer in silica than most crustal and upper mantle rocks. magmas are more viscous than solid rocks in the crust and upper mantle. all of the above

Magmas are mainly liquid and contain dissolved fluids such as water, most are less dense than the adjacent solid rock and so move upward.

Explanation:

Magma -

It is a semi solid particle and the igneous rocks are formed from magma .

Magma is basically found inside the surface of the Earth and may come out from Volcanoes , due to any tectonic movements .

The composition of magma is basically  molten form of rock along with gas bubbles and some crystals .

The magma is very dense in nature and slightly viscous and hence can flow , being semi - solid in nature .

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)