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C2 A+B

A (STRUCTURE OF EARTH)
1. OUTER LAYER OF EARTH= LITHOSPHERE
  1. cold,rigid,comprimises crust and top part of mantle
2. Tectonic plates
  1. Less dense than mantle
  2. Move due to convection currents
Crust to thick to drill
1. Information of earth collected by seismic waves
2. OR man made expolsions
Wegener's theory
1. Africa + south america one land mass
2. accepted because wide range of evidence + discusses and tested by many scientists
3. 1960's new sea floor spreading evidence
Subduction
1. Oceanic crust denser than continental crust, they colliide
  1. Oceanic plate sinks,pulling plate down and melting it as it reaches hotter part of mantle
CONSTRUCTION MATERIALS B
1. RAW MATERILS
  1. EXAMPLES 1,CLAY-BRICK. 2.LIMESTONE+CLAY-CEMENT
  2. HARDNESS MEASURED BY RUBBING 2 MATERILS TOGETHER
  3. FROM EARTHS CRUST
2. 3 TYPES OF ROCK
  1. SEDIMENTARY
    1. Limestone-made from soft sediments compressed/cemented 2gether
      1. Makes limestone soft
  2. METAMORPHIC
    1. Limestone changed by heat/pressure
    2. Composed of an interlocking mosaic of carbonate crystals
  3. IGNEOUS
    1. Granite formed when magma cools/solidifies
    2. Granite is a igneous rock with interlocking crystals, makes it very hard

C2 A+B

	Created by Ranjit97 almost 11 years ago