the earth
DESCRIPTION
This is a powerpoint I made for a university assignment, it was made with 7th grade in mind and is on The structure of the earth with a brief overview of plate tectonics.TRANSCRIPT
The Earth
-Structure-Tectonic Plate Theory
The Earth
• The earth is made up of _____ main sections.• These are the core, the mantle and the crust.• Each section is _________ and all three
sections contribute to how the earth is ______.
The Core
• The center of the _____ is known as the core.
• The core is made of ___ segments, the molten metal (Iron) section and the _____ Iron segment.
• The heat from the core _____ into the next section of the earth, the mantle and ______ it to melt.
Liquid Outer Core
Solid Inner Core
The mantle
• The mantle mainly consists of _____, which is made of ______ minerals.
• The heat from the core causes the hot magma to ____. It cools as it magma _____ again.
• This is ______ a convection current
Mantle
The Crust
• The crust is the final layer of the earths _________ is the crust.
• It consists of separated ______.• These plates float on the ___ of the
mantle.• The plates move as the follow the
convection _______. This process takes many ______ and is called the Tectonic Theory.
Crust
The Lithosphere
• The lithosphere is the name scientists give to the layer that is made by the crust and upper mantle.
• All together, this is about 75-100KM _____ beneath continents but only about 55KM thick beneath ______.
Plate Tectonics
• This theory ________ how mountains, volcanoes, and earthquakes, are formed.
• 200 _______ years ago, there was only one big continent called _______. It _____ up to form the continents we see today.
• The continents are still ______ today.
So, once again…
• Core, both inner and outer• Mantle• Crust• Lithosphere• Plate tectonics