Below the mantle is the outer core, then the inner core at Earth’s centre. The mantle extends 2,900 kilometres deep and accounts for 84 per cent of Earth's volume. GLOSSARY tectonic plates the two sub-layers of the earth's crust (lithosphere) that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches., 'floating' on the hotter convecting mantle. It's generally around 35–40 kilometres thick and is the part of Earth that moves as The crust ranges in thickness from 5 to 70 kilometres and is thinnest beneath the oceans and thickest under the Himalayas. The lithosphere consists of the relatively thin crust (the ground immeditately beneath our feet) along with the brittle uppermost layer of the mantle. Away from tectonic plate boundaries, it is about 25 ☌ per km of depth in most of the world.Įarth is made up of three main layers: the lithosphere, the mantle and the core. GLOSSARY geothermal gradient the rate of increasing temperature with respect to increasing depth in the Earth's interior. The rate of change of temperature with increasing depth in within Earth is called the Heat flows from hot to cold-Earth's inner core is hotter than 5,000☌, while the surface is generally less than 30☌ and outer space is close to absolute zero. Earth's outer layers have cooled most quickly, forming the crust heat from the core continues to radiate outwards, like any cooling object. Part of the heat is left over from the creation of Earth, which started off as a hot cloud of gas and dust and has been cooling over time. The deeper you go into the planet, the hotter it gets. If the energy stored in hot rocks inside Earth could be tapped and used instead of fossil fuels, it could help to reduce the threat of climate change. It can be used directly (for industry, agriculture, heating and cooling) or indirectly to generate electricity. It is a clean, renewable resource and it lies in abundance beneath our feet. Geothermal energy is heat from within Earth.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |