Changes In The Earth And Atmosphere

Question 1

Wegener theory

Answer 1

continental drift

300million yeaRS ago Pangaea broke into chunks that slowly drifted apart

Question 2

evidence for continental drift

Answer 2

listed the fossils of very similar organisms which had been found on in opposite sides of the Atlantic ocean
coast lines of Africa and South America matched up

Question 3

why scientists thought his theory was wrong2

Answer 3

w couldn’t explain how the continent’s moved

land bridg3mes could explain alot of his evidence

Question 4

the part of the earth that we live on 3

Answer 4

the crust

very thin surrounded by the atmosphere

Question 5

centre of the earth

Answer 5

the core
made of iron and nickel
thickest layer of the earth

Question 6

mantle

Answer 6

solid
surrounds the core
can flow very slowly in convection currents caused by radioactive decay in the core

Question 7

moving tectonic plates

Answer 7

convection currents caused them to drift

Question 8

predicting volcanic eruption

Answer 8

before an eruption molten rock rises up into chambers near the surface causing tne ground to bulge causing mini earthquakes

Question 9

gases in earth atmosphere today

Answer 9

nitrogen (80%)
oxygen (20%)
small amounts of co2 water vapour and noble gases

Question 10

how were oceans formed

Answer 10

intense volcanic activity for the first billion years after the earth was formed gave out alot of gas
as the earth cooled the water vapour in rhe atmosphere condensed forming the oceans

Question 11

Changes in the atmosphere 2

Answer 11

absorption by the ocean

absorption by plants and algae