Which type of rock would form from a lava following a volcanic eruption

When lava reaches the surface of the Earth through volcanoes or through great fissures the rocks that are formed from the lava cooling and hardening are called extrusive igneous rocks. Some of the more common types of extrusive igneous rocks are lava rocks, cinders, pumice, obsidian , and volcanic ash and dust.

Rocks that form from within the earth (like through a volcanic eruption, lava flow, magma intrusion, etc.) are known as igneous rocks. ✔

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: