Earth's Story

Think of the time from when Earth was made:

• Make it into a clock
• 4.5 billion years = 12 hours
• Earth began at noon it is now midnight
• Single-celled organisms =  first organisms =2.40 pm
• First plants=10.44pm
• First dinosaurs=11.23pm
• First species Humans = 20 seconds before midnight
• Homo sapiens = 2 seconds before midnight

Humans have been here hardly any time at all

Humans first appeared in EAST AFRICA. They began to migrate from there about 60,000 years ago. Migration was slow but people still spread all over Earth. 

Migration period = Ice Age:

e.g 15,000 years ago humans migrated on a land bridge between Asia and North America.

Ice age:

• Lasted for Thousands of years
• Ice sheets grew and retreated
• Humans reached Britain = 40,000 years ago - but they had to move south again to warmer parts of Europe
• 12,000 years ago Humans came to Britain = last ice melt

When humans lived in Africa = dark skins = dark sunlight

Northern countries = light skins = dim sunlight

Languages were created before leaving Africa

There are thousands of languages today.

Universe: 13.8 bn years old

Earth: 4.5 bn years old

Earth formation: Rocks merged together

Moon formation:  

• Smaller planet struck Earth
• Flung Rocks and dust into space
• Gravity pulled them together

Fossils tell us:

• You can find age of fossil
• Can find traces
• footprints
• remains of plants and animals

Tiny dot = condensed matter                                                                                             

Too much matter = Boom = expansion of dot

The sun was formed

Earth formed = clumped rock which stays together because of the sun

Moon formed

Earth surface cooled

Oceans are formed

Living cells appeared

Quaternary = Period we are in + Humans first appeared 

Precambrian Eon:

Coal formed in = Carboniferous period + Paleozoic era

Dinosaurs = Mesozoic era