You are watching: Why do extrusive rocks have air pockets
more Career Education
much more Prof Development
an ext barisalcity.org-TV
barisalcity.org-TV is activate by the Utah education and learning Network. Our score is come educate, engage, and also enrich the resides of Utah residents through transfer programs and services.
The Utah education Network (barisalcity.org) uses miscellaneous systems and also tools to provide distance education classes come Utah students.
Operations facility 801-585-7440Staff Directory
barisalcity.org protection Office 801-585-9888
Technical solutions Support facility (TSSC) 800-863-3496 employee Directory
Eccles Broadcast center 101 Wasatch journey Salt Lake City, UT 84112 (800) 866-5852 (801) 585-6105 (fax)
Administration (801) 585-6013 Org Chart
Instructional solutions (800) 866-5852 Org graph
Public info (801) 585-7271 Logo and Guidelines
Technical solutions (800) 863-3496 Org chart
Rocks & minerals - Rock varieties
Extrusive igneous rocks form when molten rock reaches the earth"s surface and cools. Air and moisture cool the lava rapidly. The quick cooling doesn"t permit the formation of large crystals, so many extrusive rocks have little crystals or none at all. In part extrusive rocks, favor pumice and scoria, air and also other gases room trapped in the lava as it cools. We have the right to see holes continuing to be in the rock whereby the balloon of gas were located. The most typical extrusive rock is basalt. The black color beaches of Hawaii are created from eroded basalt.
With intrusive igneous rocks the molten absent cools before it will the surface. Molten rock the is still secret is referred to as magma. Magma originates native the melting of Earth"s crust and also upper mantle. This melt occurs around a depth the 60 to 200 km. Molten rock the cools before it reaches the surface hardens to come to be intrusive igneous rock. Since it forms deep in ~ Earth"s surface, it has much more time come cool and also it develops large crystals.
Sedimentary rocks space the an outcome of the processes of weathering and also erosion which room continually break down and also rearranging them. Little rocks, fragments and organic remains that have been moved by water, wind or various other agents of erosion are referred to as sediment. Over a duration of time, sediment is cemented together to type sedimentary rocks. Sedimentary rocks have the right to be formed from metamorphic, igneous or various other sedimentary rocks that have actually been broken down through weathering. Sedimentary rocks account because that 75% the the rocks exposed in ~ Earth"s surface. In nature sedimentary rocks space usually uncovered in layers with the oldest layer top top the bottom.
There are three varieties of sedimentary rocks. The very first are referred to as clastic. Sedimentary rocks that have actually been created from the fragments of other rocks are clastic rocks. The word clastic comes from the Greek native klastos which way "broken." The following are instances of clastic rocks.
Sandstone rocks room made of good sand grains. Favor conglomerate, the seed of sand have been cemented together. Rubbing the surface ar of sandstone rocks may an outcome in small grains the sand gift rubbed turn off of the rock.
Shale is consisted of of an extremely fine grains of clay prefer particles. The structure of shale is really smooth to the touch. If you apply pressure come the shale, the is feasible to rest it into pieces that also have smooth textures.
The second form of sedimentary rocks room the result of chemistry deposits. Halite is an example of a absent that developed when water evaporated and also left behind minerals. Sedimentary rocks that result from chemistry deposits are referred to as chemical rocks.
has actually what you view in this video clip ever happened to you? You take a peanut butter and also jelly sandwich come school. You examine your backpack at lunch and also find that your publications have been sitting ~ above the sandwich all day! The warmth of the day and pressure the the books have mushed the sandwich into a totally different shape. Your lunch has actually experienced what rocks endure deep in the interior of Earth, the procedure of metamorphism.
Rocks that have changed shape or composition because of intense heat and also pressure are called metamorphic rocks. Metamorphic rocks are developed from sedimentary, igneous or other metamorphic rocks. Lock are developed deep within the earth. Heat and pressure native the rock over flatten and bend the rock. The texture of metamorphic rocks room classified right into two categories:foliated and non-foliated.
See more: What Is 3 Out Of 5 As A Percentage Of 3 Out Of 5 As A Percentage?
In foliated metamorphic rocks, the ingredient of the original rock is not apparent. This is due to the fact that as the heat and also pressure have actually resulted in a recombination to kind new minerals in the rock. The separation, personal, instance mineral grains may recrystallize to form larger crystals the make parallel bands or present in the rock. Three typical foliated rocks room slate, gneiss and schist. Notification the foliation or present in the rocks below.
Slate is developed by the heating and pressure ~ above shale. Since slate the end so easily along the bands, the is used to do roof and floor tiles.
drag your mouse over the image to see the rock from the result of adding heat and pressure.
Heat and also pressure ~ above basalt have the right to make schist.
drag your computer mouse over the picture to see the absent from the result of adding heat and pressure.
Granite can also go under heat and also pressure to make a rock dubbed gneiss.
traction your computer mouse over the image to check out the absent from the result of including heat and also pressure.
Marble is developed from limestone, which is formed from calcite. Even though limestone and also marble room made that the same thing, sculptures would never use limestone because that making statues. Marble is used due to the fact that it is compact and also has enlarge crystals from all of the heat and pressure
drag your mouse over the image to check out the absent from the an outcome of adding heat and pressure.
traction your computer mouse over the photo to check out the rock from the result of including heat and also pressure.