The composition of the earth, with multiple layers going down to a central core, is examined here. At the crust, continental and oceanic plates travel over millions of years.
A video display shows types of volcanoes, which are common at the edges of these tectonic plates.
The Earth is continually recycling and renewing, with new rock emerging.
Oceanic crust tends to sink beneath continental crust. Because of this, continental crust is older.
Here are some examples of zeolites, minerals that forms inside basalt lava as it cools.
Ophiolites are pieces of continental crust that get sheared off and pushed onto land.
We'll pick up here tomorrow, looking more at volcanoes.
Good series. We should never underestimate the power of nature.
ReplyDelete