<u>Answer:</u>
<em>Cirques often contain small lakes called </em><u><em>tarn</em></u><em>.
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<u>Explanation:</u>
Cirque is a depression or a valley-like formation developed from the erosion of the glacier. They are formed in the mountain ranges. The slopes are steep and melted ice flows down to the floor.
The floor of a cirque is a bowl-shaped structure. The ice from all the sides from melting glaciers fill in the floor. When the glacier melts and slides the sides of the cirque, the floor converts into a lake. This small lake is called a tarn.
The sun causes evaporation.
Answer:
1. A tundra is a type of biome where the tree growth is hindered by low temperatures and short growing seasons.
2. A savanna or savannah is a mixed woodland-grassland ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close.
3. An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea.
Green house effect is the trapping of heat by some gases ! mainly in our earth this is increasing due to CO2 !
