ChLapter 2 Flashcards
How much water is covering the Southern Hemisphere
80%
Four large basins
Pacific, Atlantic, Indian, arctic
What is the deepest and oldest basin
Pacific
Evolutionary Scientist believed the earth was created
4.5 billion years ago
Big Bang
Theory not fact
What allows water to stay liquid
Earth distance from sun
Core
Innermost layer solid inner core liquids outer core. Iron rich
Mantle
Middle layer semi plastic composition
Crust
Outermost layer thinning portion
Oceanic crust
Made up of dark colored mineral, basalt, enter than continental
Continental crust
Light colored granite construction mainly
Oceanic crust
3.0 g/cm density Only about 5 lm or 3 miles thick Geologically young Dark in color Rich in iron and magnesium
Continental crust
2.7 g/cm density 20 to 50 km or 12 to 30 ,lies thick Can be very old Light in color Rich in sodium, potassium, calcium, and alimunim
Alfred wegner
Proper 1912 the continental drift
When did wegner propose Pangea started breaking
180 million years ago
Why wasn’t the continental drift accepted at the time
Wegner couldn’t explain how
What explains the how in we genres theory
Plate tectonics
Main features of plate tectonics
Earth surface covered by a series of crustal plates
Ocean floors are constantly moving spreading in center sinking in edges
Convection assist movement
Heat from mantle drives these currents
Mid oceanic ridges
Rise from ocean floor
A chin of submarine volcanic mountains