C2 A+B

C2 A+B

1. A (STRUCTURE OF EARTH)

   • OUTER LAYER OF EARTH= LITHOSPHERE
     • cold,rigid,comprimises crust and top part of mantle
   • Tectonic plates
     • Less dense than mantle
     • Move due to convection currents

2. Crust to thick to drill

   • Information of earth collected by seismic waves
   • OR man made expolsions

3. Wegener's theory

   • Africa + south america one land mass
   • accepted because wide range of evidence + discusses and tested by many scientists
   • 1960's new sea floor spreading evidence

4. Subduction

   • Oceanic crust denser than continental crust, they colliide
     • Oceanic plate sinks,pulling plate down and melting it as it reaches hotter part of mantle

5. CONSTRUCTION MATERIALS B

   • RAW MATERILS
     • EXAMPLES 1,CLAY-BRICK. 2.LIMESTONE+CLAY-CEMENT
     • HARDNESS MEASURED BY RUBBING 2 MATERILS TOGETHER
     • FROM EARTHS CRUST
   • 3 TYPES OF ROCK
     • SEDIMENTARY
       • Limestone-made from soft sediments compressed/cemented 2gether
         • Makes limestone soft
     • METAMORPHIC
       • Limestone changed by heat/pressure
       • Composed of an interlocking mosaic of carbonate crystals
     • IGNEOUS
       • Granite formed when magma cools/solidifies
       • Granite is a igneous rock with interlocking crystals, makes it very hard