Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Scientists can't say exactly when the plates will move because
we have no way of seeing inside the mantle because it is so hot
we would be burnt up.
However... scientists can look at clues to get a rough idea about
when and where earthquakes and volcanic eruptions will take
Clues for Earthquakes: Strain in underground rocks
Clues for volcanic eruptions: Molten rock rising up to make the
ground bulge and mini earthquakes near the volcano.…read more

Page 3

Preview of page 3

Here's a taster:

There were a few problems with his theory. First he couldn't say
why they were moving, second, he used some inaccurate data
in his calculations about how fast they were moving apart. So,
no one believed him for many years.
Modern Theory
In the 1950s they were able to study the sea floor and
discovered that Alfred Wegner was not correct, but had the right
idea.…read more

Page 4

Preview of page 4

Here's a taster:

As the earth cooled a thin crust was made and the water vapour
in the air condensed into oceans. Then green plants and algae
developed that were happy in the CO2 atmosphere. These plants
created O2 through photosynthesis and locked away the carbon
inside them. These plants died and were buried under layers of
rock to create fossil fuels.
The Ozone layer
The oxygen killed off some of the earliest organisms, but it also
allowed the ozone layer (O3) to be created.…read more

Page 5

Preview of page 5

Here's a taster:

It's cooled to 200C so it becomes a liquid
Water vapour condenses and is removed
The liquified air is heated slowly in a fractionating column.
The remaining gasses are separated by fractional
distillation.…read more


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »