Changes In The Earth And Atmosphere Flashcards
What is the earth made up of?
Thin crust, mantle, core
What is the core made up of?
Nickel and iron
How thick is the crust?
10 - 100 km thick
What is the mantle made up of?
Has properties of a solid but flows very slow
What is the inner core made out of?
Solid
What is the outer part of the core made out of?
Liquid
What did scientists used to believe?
That mountain ranges was caused by the earth shrinking
What evidence is that that South America and the West Coast of Africa was joined together?
Closely matching coastlines, similar patterns of rocks which contain the same patterns of rock
What did Alfred Wegener call the South America and Africa spilt?
Continental drift
What are tectonic plates?
Huge sections of the earth that move in relation to one another
How are convection currents formed in mantle?
Intense heat released by radioactive decay
What was miller and Uranus theory?
Made an experiment where the same chemicals that was on early earth, it was heated and sparks was added, they kept heating and cooling. The cycle then stated to show amino acids which are the building blocks to life.
What was miller and ureys theory called?
Primordial soup theory
What three gases was on earths early life?
Water, methane and ammonia
How much oxygen is on today’s earth?
About 21%
