About 26 million years ago, an asteroid of size about

10 km hit Lonar in Maharashtra and wiped off large creatures like dinosaurs.

About 65 million years ago, a 5 mile wide

asteroid hit the earth in the Yucatan Peninsula wiping out about 75% of life

forms including Dinosaurs

A 200 feet wide asteroid exploded above Tunguska

(Siberia) destroying about 700 km

wiping out large creatures like

dinosaurs.

Most severe killing took place about 200 million

years ago. More than 95% of life forms, including dinosaurs, was wiped away.

photosynthesis like weeds is hindered.

Increase

in the productivity of plants following C

photosynthesis like rice,

wheat, etc.

Increased

rainfall due to the increased evaporation at higher temperatures.

Increased ocean productivity due to the higher

temperatures

They predicted, for the first time, about the forthcoming

global warming and its adverse effects on humans and the environment.

They predicted the accumulation of the CFCs in

the stratosphere and the probability of the depletion of the ozone layer there.

They could estimate, for the first time, the

global warming effect of HFCs and HCFCs.

They invented alternatives for the CFCs that

will not reach the stratosphere due to the presence of H atoms.

bubbles back to

atmosphere.

Depth between 500m

~ 1000m – CO

Depth above 1000m –

liquid CO

bubbles back to

atmosphere.

Depth between 500m

~ 3000m – CO

Depth above 3000m –

liquid CO

bubbles back to

atmosphere.

Depth between 100m

~ 300m – CO

Depth above 300m –

liquid CO

Depth between 200m

~ 400m – CO

Depth above 400m –

liquid CO