Structure of Earth science YR8

What is the structure of Earth?

Solid and liquid iron core, solid but fluid rock mantle, and a solid rock crust with liquid oceans and gaseous atmosphere on the surface

How did earth get formed?

The early earth made of liquid, rocks, and metal got heated by the gravitational impact by the debris.

Composition of core

When the Earth was still very hot, the dense iron sank to form a solid inner and molten outer.

WHat is the core responsible for?

it is responsible for changing Earth's magnetic field

Composition of the mantle

The lighter material than iron, made mainly of aluminum and magnesium silicate formed the hot solid mantle

Composition of the crust

The solid crust is a thin layer of bass salt, mainly magnesium silicate and silica mix which is made with fully solidified magma. lighter continets is mainly made of less dense granite which is aluminum silicate and silica mix.

What is the density formula

Density = mass/volume

What were the evidence that there was Pangaea?

The continets looked like puzzle peices, there was fossils from south America that was very similar to the fossils in Africa

What geological process describes the creation of new oceanic crust at mid-ocean ridges?

Seafloor spreading. rocks is being spit up along the pacific ridge and its spread.

Are rocks at the middle of the ocean older or younger than rocks at the sides?

Younger in the middle, and older at the sides because of the rocks from seafloor spreading is new.

How does seafloor spreading work?

Tectonic plates pull apart at divergent boundaries, allowing hot magma from Earth's mantle to rise, cool, and solidify

What is the 2 cores?

The solid core is inside the liquid core. They are both Iron.

How does the iron core generate Earth's magnetic field

The swirling convection currents from the liquid iron core generate the Earth's magnetic field.

How does the liquid iron core have convection currents?

The liquid iron core is between the cold solid iron core and the hot mantle. Causing a convection current

How does the solid iron core not melt?

Despite reaching very high temperatures, immense gravitational pressure keeps the solid iron core from melting.

How does continents move?

The convection current from the mantle causes friction on the tectonic plates and it.

How does mantles have convection current?

The mantle is in between the hot iron core and the cold crust, causing a convection current.

What does the great global rift system responsible do?

The great global rift system moves continets and does seafloor spreading

What is ocean trench?

It forms at a convergent plate boundary through subduction, where a dense oceanic tectonic plate slides underneath a lighter oceanic or continental plate and bends downward into the mantle.

What is rifting?

The comvection current of the mantle pull the crust apart, developing a ridge that sea floor spreads and moves continets.

What happens when ocean plate and oceanic plate diverge?

They cause ocean ridges that seafloor spreads.

What happens when continental plate and continental plate diverge

they cause rift valleys, volcano activity, new ocean basin

Which 2 types of plates is more denser

Oceanic plate is denser than continental

What happens when continental plate and continental plate converge?

They crash head on and cause mountain ranges

What happens when oceanic plate and oceanic plate converge?

The older oceanic plate is denser and slides beneath the younger, less dense oceanic plate, causing deep ocean trenches and volcanoes island arcs.

What happens when continental plate and oceanic plate converge?

The denser oceanic plate slides beneath the continental plate and causes deep ocean trenches, volcanic mountain ranges.