Slides in this set
Earth + Space
collections (Milky Way)
Solar system 5000myo
Created when dust and
gas pulled together by
gravity making clumps....
Sun is a star;
Made of hot gases…read more
Dating the Earth
Rocks change very slowly due to erosion
Deeper the rock the older it is.
Estimating the age of something like a rock by
measuring its radioactivity.
Also used on fossils (stony remains of an animal or
plant that lived millions of years ago).…read more
Originally described in 1915 by Alfred
Wegener (a meteorologist).
Idea that crust consists of a number of
tectonic plates which constantly move
Either away from, against or alongside each other.
Move between 2 and 20cm a year.
Now measured using satellites.…read more
Fossils and rocks Against;
identical in Africa and You cannot see or feel
South America. continents moving.
Continents fit like a Land bridge could
jigsaw. have joined Africa and
Land bridge; S America.
Rocks lightest at the
top cannot sink into Wegener not a
heavier rocks. geologist (rock expert).…read more
Theory now accepted after initial criticism.
Proved by mapping major oceans. Ridges
(mountain chains) down the centre of oceans
emit molten lava which cools to make new rock
This is constantly pushed along to make way for
newer rock. Shown by magnetic stripes of the
Earths field direction of the time.
Discovered by scientist Fred Vine (1963).…read more