Transcript What are the causes of plate Movement?

Tectonic Activity
Unit 1
Which
one
are
we
like?
Structure of the earth
Structure of the earth
The Core
Temperatures about 6000C but due to huge
pressure solid (hotter than the surface of
the sun)
Mantle
Consists of melted rocks. Temperatures
around 3500C. The mantle tends to
creep and flow like a ‘toffee’ like mixture.
Crust
A thin layer on the outside of the earth. The
crust is broken into smaller pieces, these
pieces are known as plates. Plates float
on the mantle and can move around.
Plate
A huge section of the earths crust that floats
on the mantle
There are two types of plate
Oceanic plates (sea crust)
A thin layer between 6-10Km
Dense (or heavy)
Young rock (basalt)
Continental Plates (land crust)
Thicker, between 20-70km (thickest
under mountains
Light ( not as heavy)
Old rock (granite)
Why do plates move?
Any Ideas?
Use Complete Geography p6+7 and this link to help you draw and explain
why plates move
http://www.sln.org.uk/geography/schools/blythebridge/animations.htm
Test Yourself
1. Answer the questions on p7 of Complete
Geography
2. http://www.bbc.co.uk/schools/gcsebitesiz
e/geography/platetectonics/