EXTRUSIVE IGNEOUS ROCK
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.
You need at least 3. seismic stations provide only a circle around the station. so from geometry 3 circles intersect in a point. that is why you need 3 stations
In the ocean, it is colder in the deeper parts and warmer in the shallow parts.
The correct answer is - separates powers, keeping one body from gaining too much power.
The bicameral legislature, in essence, is formed with the purpose of not allowing one body to became to powerful and to be able to perform whatever it likes without the consensus of the others. Bicameralism divides the legislators into two separate houses, assemblies, or chambers.
