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Sedimentary, Igneous and Metamorphic rocks
Terms in this set (4)
Metamorphic rocks originate from sedimentary and igneous rocks and are characterised as a rock that has been changed by heat or extreme pressure. This change is a chemical reaction occurring in the Earth's crust that creates a structural change.
There are two types of metamorphic rocks that are identified in the way they're changed. Contact metamorphism is a rock that has been changed by heat produced by magma, these rocks were originally igneous rock and regional metamorphism is a rock that has been altered by both heat and pressure, the pressure creating these rocks are often associated with the formation of mountains.
In both formations minerals in the rock break down and form new minerals through a process called recrystillisation. Rocks that recrystalise, texture may change and their size may alter.
There are many types of metamorphic rocks including amphibolites that originate from basalt and marble and slate that stemmed from limestone and sandstone.
Igneous rocks are formed when red-hot lava and magma solidify; however the location either above or below the earth's surface determines whether the rock is extrusive igneous rock or an intrusive igneous rock. Extrusive rocks are formed above the earths surface and intrusive rocks are formed by the crystallization of magma below the earths surface. These types of rocks create all the oceans crust. Igneous rocks typically form near oceanic island, close to the tectonic plates (also known as the ring of fire) or on rifting continents.
Sedimentary rocks are layers of rock formed through weathering, erosion, dissolution, transportation of particles and biochemical transpiration or more simply transported by water, wind or gravity. Weathering is the change in appearance or texture of a rock because of a lengthy exposure to the atmosphere; chemical weathering and atmospheric weathering creates natural monoliths such as Uluru. Deterioration is the decay of a rock due to wind, water or organic medium. Dissolution is the process of dissolving.
Sedimentary rocks cover 70% of the earth's surface and can show scientist the climate and environmental changes in the area, the oldest layer being the bottom.
How are frothy rocks formed
from violent volcanic eruptions, when they shoot out lava filled with gasses. The lava cools quickly while it is still airbourne and traps the gasses inside producing frothy rocks such as pumice, scoria, and several types of bassalt
THIS SET IS OFTEN IN FOLDERS WITH...
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