Minerals in Britain Flashcards
What are the outer layers of Earth called that are divided into massive portions of rock?
Tectonic plates
Why can tectonic plates move?
Because of convection currents in the mantle
How can the Earth’s magnetic fields be detected?
When lava has cooled, magnetite can become magnetised in the direction of the Earth’s magnetic field at that particular tim
Near the poles, magnetisation is at an angle to where?
The horizontal
Near where does magnetisation lies horizontally?
The equator
What does the study of sedimentary rock provide?
Evidence of the conditions under which they were formed
What are ripples in a fossil formed by?
Wind blowing/water flowing
How was coal formed?
When plants have died and formed peat due to a lack of oxygen, the peat has been buried by sediment leading to compression and heating
How was rock salt formed?
Seawater that was inland millions of years ago created salt marshes. As water in these marshes evaporated rock salt was left behind
