In this article, we will talk about the interesting facts about the Crust. The term Crust in geology refers to the outermost solid shell of a rocky planet or natural satellite. It is chemically distinct from the underlying mantle. To know more facts about the Crust check the list below.
Facts about the Crust 1: Earth’s Crust
A great variety of igneous, metamorphic and sedimentary rocks are the composition of the Earth’s Crust. It occupies less than 1% of Earth’s volume.
Facts about the Crust 2: Structure of the Earth
Crust is categorized in the Shells of the Earth together with Lithosphere, Asthenosphere, Mesosphere, Mantle, Outer core and Inner core.
Facts about the Crust 3: The Temperature of the Crust
The temperature of the crust increases with depth, reaching values typically in the range from about 200 °C (392 °F) to 400 °C (752 °F) at the boundary with the underlying mantle. It is increases by as much as 30 °C (about 50 °F) for every kilometer locally in the upper part of the crust, but the geothermal gradient is smaller in deeper crust.
Facts about the Crust 4: The Composition of the Crust
The continental crust has 0.6% weight of the silicate on Earth. It has an average composition similar to that of andesite.
Facts about the Crust 5: Mantle
The crust is underlain by the mantle. Peridotite is the most composition of the upper part of the mantle. Peridotite is a rock denser than rocks common in the overlying crust. The boundary between the crust and mantle is conventionally placed at the Mohorovi?i? discontinuity, a boundary defined by a contrast in seismic velocity.
Facts about the Crust 6: Less Dense Crust can be Destroyed by Subduction
Subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge.
Facts about the Crust 7: Moon’s Crust
The crust is formed by the cumulate rocks. The upper part of the crust probably averages about 88% plagioclase while the lower part of the crust may contain a higher percentage of ferromagnesian minerals such as the pyroxenes and olivine, but even that lower part probably averages about 78% plagioclase.
Facts about the Crust 8: The Oceanic Crust
The oceanic crust is 5 km (3 mi) to 10 km (6 mi) thick and is composed primarily of basalt, diabase, and gabbro. It is float on the mantle.
Facts about the Crust 9: 2.0 Billion Years Old
The scientist estimated that 2.0 billion years is the average age of the current Earth’s continental crust. While the most crustal rocks located in cratons is formed before 2.5 billion years ago.
Facts about the Crust 10: The Oldest Continental Crustal Rocks on Earth
The oldest continental crustal rocks on Earth have ages in the range from about 3.7 to 4.28 billion years and have been found in theNarryer Gneiss Terrane in Western Australia, in the Acasta Gneiss in the Northwest Territories on the Canadian Shield, and on other cratonic regions such as those on the Fennoscandian Shield. Some zircon with age as great as 4.3 billion years has been found in the Narryer Gneiss Terrane.
Hopefully those interesting Facts about the Crust will enrich your sources of reading about the Crust.