Basalt (a dark-colored rock, like the rocks that make up the Hawaiian volcanoes).
Continental crust is also less dense than oceanic crust, whose density is about 2.9 g/cm 3. Continental crust is considerably thicker than oceanic crust, mostly 25 to 70 km versus the average thickness of the oceanic crust of around 7–10 km. About 40% of Earth's surface is now overlaid by continental crust. Continental crust makes up about 70% of the volume of Earth's crust Oceanic crust is the part of the Earth's crust that makes up the seafloor. It's thinner, denser, and simpler in structure than the continental crust. Oceanic crust is also younger, on average; from its birth at a mid-ocean ridge to its end at a subduction zone is no more than 250 million years. A term that is sometimes used for oceanic crust rocks is sima, which is short for magnesium silicate, a common component of these rocks. Another term for these undersea igneous rocks is mafic, which comes from the fact that they are high in magnesium and iron. Basalt and gabbro are examples of mafic rock Rockhound. Oceanic crust is predominately made of basaltic rock with a thin layer of sedimentary rock on top. Continental crust is predominately made of granitic rock, with a thin layer of sedimentary rock covering much of the visible surface.  The oceanic crust is part of the crust that is made fully out of basaltic rock and is several times thinner than the continental crust which is made out of granitic rock. Ocea … nic crust underlies Earth's oceans and is produced at divergent plate boundaries which are commonly referred to as mid-ocean ridges. The oceanic crust is made out of basalts - (lava-hardened Iron/Magnesium Silicate mixtures which solidified rapidly). Oceanic crust is the uppermost layer of an oceanic tectonic plate. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together comprise an oceanic plate. The plates of the Earth together are referred to as the lithosphere. Oceanic crust is the result of erupted mantle material originating from below the plate, cooled and in most instances, modified chemically by seawater. This occurs mostly at mid-ocean ridges, but also at scattered hotspots, and also in rare but powerful occurences known as flood basalt eruptions. Oceanic crust is significantly simpler than continental crust and generally can be divided in three layers. 1  Layer 1 is on an average 0.4 km thick. 2  It consists of unconsolidated or semiconsolidated sediments, usually thin or even not present near the mid-ocean ridges but thickens farther away from the ridge. The continental crust is made mostly of rocks with a composition similar to granite (a light-colored rock you would expect to find in the Sierra Nevada), whereas the oceanic crust is made mostly of rocks with a composition of basalt (a dark-colored rock, like the rocks that make up the Hawaiian volcanoes). Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. This is partly why the continents are at a higher elevation than the ocean floor. The continental crust is made of granitic rocks, which have even more silicon and aluminum than the basaltic oceanic crust; they also have more oxygen thanks to the atmosphere. Granitic rocks are even less dense than basalt. Oceanic crust covers about 60 percent of the Earth's surface. Oceanic crust is thin and young—no more than about 20 km thick and no older than about 180 million years. Everything older has been pulled underneath the continents by subduction. Sima – Oceanic Crust. The ocean floor is made primarily of extremely dense rock which scientists call sima. Sima is made out of two basic substances. These substance are silica, and magnesium. Sima tends to be younger than the rocks found on continents.  the continential crust is made of granitic rocks and the oceanic crust is made of basat and gabbro. the temp of the continential crust is -84.4 to 70.7c and the temp for ocean … ic crust is -18 to 380c and the lithopheric plates are made of felsic rocks. good luck with the rest. 8 people found this useful. The oceanic crust is made out of basalts - (lava-hardened Iron/Magnesium Silicate mixtures which solidified rapidly).
https://en.wikipedia.org/wiki/Continental_crust http://study.com/academy/lesson/oceanic-crust-definition-composition-facts.html http://www.answers.com/Q/What_is_oceanic_crust_and_continental_crust_made_of http://www.answers.com/Q/What_is_the_oceanic_crust_made_of https://en.wikipedia.org/wiki/Oceanic_crust http://www.scienceline.ucsb.edu/getkey.php?key=3657 http://geology.about.com/od/platetectonics/a/thecrust.htm http://www.kidsgeo.com/geology-for-kids/0039-sima-oceanic-crust.php http://www.answers.com/Q/What_is_the_oceanic_crust_made_of
oceanic crust is made of