Name the green houses gases.

What do you mean by green houses effect?

Name the green algae which is used as protein-rich food by space travellers.

Which of the following gases is not a greenhouse gas?

Name two poisonous gases which can be prepared from chlorine gas.

What is green house effect?

Name two crops produced in green houses with increase carbon dioxide concentration.

Name the diseases which are caused by SO_2 and NO_2 gases.

Fom a window 60m high above the ground of a house in a street ,angles of elevation and depression of the top and the foot of another house on the opposite side of the street are 60° and 45° respectively. Show that the height of the opposite house is 60(1+sqrt 3)m