Inside-earth

Inside earth

We can,t explore much of earth – our deepest mines only
travel about 1.6 (1miles)into the crust. However there are scientific ways to
find out what it is like inside.

Geologists are able to study rocks from all depths within
earth,s crust, because collision between continents push up rock that used to
be below the surface,  forming mountains.
In some area,s collision have even unearthed vast swathes of the mantle. Volcanoes
also sometimes erupt lumps of rock from the mantle. Volcanoes also sometimes
erupt  lumps of rock from the mantle.
Under the mantle is the core, which scientists have used theb wave from
earthquakes to workout that the core is split into two layers – a liquid outer
core and a solid inner core.continental crust thicker and less dense then the
oceanic crust  rifting two tectonic
plates pull away from eachother, and new land created between them. Oceanic
crust tinner and denser than the continental crust. Subduction when two plates
meet , one can be pushed under neath the other. Pacific ocean crust earth’s
outerlayer, which is distinct from the mantle though both layers are made of
rock south American coast hotspot mantle plume an upwelling within  the mantle SENDs magma to volcanoes. Inner
core a ball of very hot but soild, because of the immense pressure.

Volcanoes in Hawaii

The Hawaiian islands in the mid- pacific have been build by
volcanic eruptions. The rock that fomed them was pushed to earth,s surface by
hot rock  moving upward in the mantle.

Layered earth

The earth made up of many rocky layers. The top layer is
crust. Below that, uniform and slightly denser rock form the mantle. The crust
and the top of the mantle form a single rigid layer together, which is called
the lithosphere this broken into sections called tectonic plates. Below the
lithosphere is the asthenosphere. Only tiny parts of the astenosphere are
liquid, but it is soft enough to move, pushing around the plate above. Under
the mantle lies the core. The outer core is a liquid mix of iron and sulphur,
while the inner core is solid iron and nickel.

The atmosphese

Earth,s atmosphere is made up of gases, which are held in
place by gravity. There is no clear boundary 
to the outer edge of the atmosphese-it just fades into space. ‘’outer
space’’ is generally thought to begin about 100km (62miles ) above the surface.