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Earth's Formation and Layers

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Across
Made up of the crust and the upper mantle. Floats on the asthenosphere.
Thinnest and least dense layer of Earth.
This began to form after volcanoes released toxic gases into the air.
Crust, mantle, core are the 3 main ______ within the Earth.
Middle mantle is also called this. area where convection currents occur.
The only layer of Earth that's liquid
The breakdown of an atom into two smaller atoms
Earth's layers are arranged in this way because of this.
The densest layer of Earth, made of iron.
Bombarded Earth for over 20 million years and brought salt and water
Type of crust below oceans
Formed when meteors bombarded Earth. Spewed gases that later helped form the atmosphere.
the core is made of ______ as opposed to rock.
Down
Brought to Earth by billions of meteors containing small salt crystals.
This metal makes up the inner core
The lithosphere is split into these. They move due to the convection currents in the asthenosphere.
Part of the mantle that is part of the lithosphere.
Type of crust that makes continents
Includes the asthenosphere and part of the lithosphere
Collisions of these objects led to the formation of Earth.
The process by which Earth was formed. Started with small particles colliding until larger objects began to come together.
Hot matter rises because it's less dense and cold matter sinks because it's more dense
These were the very first life forms and were the first to produce oxygen on Earth.
Collisions with other planetoids caused early Earth to __________. This allowed layers to form .
The crust and the mantle are composed of this material.
One big difference in the atmosphere of early Earth and today is that the early atmosphere had none of this.