Unit 1 Topic 4-The Ever-Changing Earth

The tectonic plates move due to convection currents in the mantle.The convection currents are caused by the heat released from radioactive decay.

Convergent Boundaries crumble the edge of plates forming mountains.

Divergent Boundaries,rock magma beneath the surface causing volcanic erruptions.

Consevative boundaries cause earthquakes.

4 Billion Years ago- Will be changing this slide

Magma.

Clouds.

Rain.Sea

Microrganisms-Antibes.

Plants

Present Day

1915 not scientifically accepted.

Wegener could not explain why the plates moved.

Suggested that the plates were once joined-Overtime moved apart.

Observed coastlines-Jigsaw fit.

Similar patterns-Rocks,fossils of continents seperated by oceans.

1960s-Widely accepted-Scientists had found evidence to show that the plates had moved as a result of convection currents in the mantle.

Study of the ocean floor-Large mountains ranges and deep trenches found.Thought seabed was once flat.

Dating techniques using radioisotopes-Ocean crust was very young compared to the continents.

Rocks keep a record of the magnetic field-Changes time to time.Evidence of seafloor seperating.

Effects-

Changing weather patterns.

Flooding.

Quicker melting of the ice caps and glaciers.

Rising sea levels.

Carbon Capture-

Scientists are thinking of storing Co2 produced by burning fossil fuels under the sea in geological formations.

Fuels-Oil,petrol-Impurities compounds,Sulpfur,Nitrogen.

When burning produces-Polluting gases,Sulfur Dioxide and oxides of Nitrogen.

Acidic Rain-Forms when Sulfur Dioxide is released from factories-Sulfuur Dioxide reacts with rain to form Sulfuric Acid.

Kills plants,aquatic life-fish,damages buildings and statues made of limeston and metals e.g. bridges.

Sulfur Scrubbing-

Removing Sulfur Dioxide from exhaust gases of fossil fuels.

Good Luck.