Suchergebnisse
Suchergebnisse:
24. Mai 2017 · For decades, geophysicists had observed seismic waves slowing down in two areas beneath the crust on roughly opposite sides of the Earth: one below the Pacific Ocean and the other below Africa. They discerned that the masses were huge — each the size of a continent, 100 times the height of Mount Everest, and around 1,800 miles beneath the ...
12. Juni 2014 · A reservoir of water three times the volume of all the oceans has been discovered deep beneath the Earth’s surface. The finding could help explain where Earth’s seas came from.
- Andy Coghlan
- The CORE
- The Mantle
- The Crust
- Tectonic Plates
- Volcanoes and Tectonic Plates
- Earthquakes and Tectonic Plates
Let’s start at the very centre of the Earth. The word ‘core’ means the central part of something, for example, an apple has a core. The Earth has an inner core and an outer core. Scientists think that the inner core is solid and mainly made of iron. Iron is very hard – that’s why knights used it to make their armour. The outer core is also mostly i...
The next layer is called the mantle. It is made of rock. It is very hot in this part of the Earth, causing the rock to behave a little bit like a liquid and a solid.
The crust is the part of the Earth that we walk on. Compared to the other layers, it is quite thin and breakable. You can think of the crust of the Earth as being a bit like the crust of a pie – although this crust is 5–70 km deep depending on whether you are under the ocean or on top of a mountain! The Earth’s crust is not one continuous surface l...
Scientists think that the crust of the Earth is made up of six large (major) tectonic plates and a few smaller ones. These plates fit together like puzzle pieces and float on the partially molten mantle. They slowly move and bump against each other at a rate of a few millimetres to up to 20 cm per year. It is this bumping and rubbing that causes ea...
The hot, melted rock in the mantle doesn’t usually make it through the many kilometres of crust that forms the ground we walk on. It’s only at places like the edges of tectonic plates that magma starts to creep through. Think of our Earth as being a bit like a hot mince pie. The filling stays in place until there is a break in the crust. Then, the ...
Although the tectonic plates fit together like puzzle pieces, they still move a bit. Think about how you can wiggle a puzzle once it’s put together. The plates build up energy when they push against each other. When the pressure gets too much, something has to give (like when you bend a stick until it breaks). The sudden movement of these undergrou...
11. Dez. 2018 · Far below the scant surface spaces we inhabit, the planet is teeming with an incredibly vast and deep 'dark biosphere' of subterranean lifeforms that scientists are only just beginning to comprehend.
The ringwoodite came from the “transition zone” between the upper and lower mantle, about 400 miles below the Earth’s surface, and about 1.5% of its weight turned out to be water. If a lot of...
Cave explorer and geologist Francesco Sauro travels to the hidden continent under our feet, surveying deep, dark places inside the earth that humans have never been able to reach before.
11. Dez. 2018 · Now, an international group of scientists report there’s 16.5 to 25 billion tons of micro-organisms beneath the planet’s surface. The team’s work is redefining what a habitable...
