basaltic crust造句

• Earth has probably always had some form of basaltic crust, but the age of the oldest oceanic crust today is only about 200 million years.
• Subducting slabs are composed of basaltic crust topped with pelagic sediments; however, the pelagic sediments may be accreted onto the forearc-hanging wall and not subducted.
• Some argue that continents are accretionary crustal " rafts " that, unlike the denser basaltic crust of the ocean basins, are not subjected to destruction through the plate tectonic process of subduction.
• Thermoremanent magnetization is the main source of the magnetic anomalies around mantle, cools to form new basaltic crust on both sides of the ridge, and is carried away from it by seafloor spreading.
• Ceres appears to be composed of a rocky core covered by an icy mantle, where Vesta is thought to have a nickel-iron core, olivine mantle, and basaltic crust . 10 Hygiea, however, which appears to have a uniformly primitive composition of carbonaceous chondrite, is thought to be the largest undifferentiated asteroid.
• The Bransfield Strait, the result of this extension, is presumed to be four million years old or less; magnetic anomalies created by the formation of new basaltic crust and aligned with the axis of the Bransfield Rift indicate that the newly formed oceanic crust in the Bransfield Strait is roughly 1.3 million years old.