Twinkle twinkle little starHow I wonder what you areUp above the world so highLike a diamond in the skyTwinkle twinkle little starHow I wonder what you are

AstronomyAstronomy

astronomerastronomer

BRAIN BIG BANG

physicist chemist

biologist geologist

How life began on the earth

Stage 1 The origin of the earth

Stage 2 The development of the earth

Stage 3 The origin of the life

Stage 4 The development of life

Good morning, I am …. I’m greatly

honored to be here to give you a speech

about how the life began on the earth …

Big bang stars and dust

a solid globe

Stage 1The origin of the earth

a cloud of dust

Time Atmosphere Appearance Adjectives to describe them

4.5-3.8 billion years ago

3 billion years later

cool down

N2 CO2

Water vapourharmful gases…

N2

O2 CO2

H2O(gas)

It _______ loudly with fire and rock

Water _________ on the ______ of the earth to form ______ and ____.

Stage 2The development of the earth

exploded

appeared

surface

oceans seas

Stage 3The origin of the life

Water?

The continued presence of water? or

(dissolve , harmful, acids, chain reaction…)

Stage 4 The development of life

1________________ 2____________________

3________________ 4__________5__________

6_________ 7__________8__________9__________

small plants in water shellfish and all sorts of fish

green plants on land insects (on land)amphibians (on land as well as in the water)

forestsreptiles (appear)

dinosaurs (exist, lay, extinct)mammals ( spread, give birth to)

plants animals

(multiply)

(encourage)First…

Then…

After that…

(followed in time)

What’s the next stage?