Explanation:
If water did not expand when freezing, then it would be denser than liquid water when it froze; therefore it would sink and fill lakes or the ocean from bottom to top. Once the oceans filled with ice, life there would not be possible.
Answer:
Atmosphere layers. Earth's atmosphere is divided into five main layers: the exosphere, the thermosphere, the mesosphere, the stratosphere and the troposphere. The atmosphere thins out in each higher layer until the gases dissipate in space.
Explanation:
The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.
B. Population is the answer
(1) Meteorological/Climate factor: -Rainfall intensity -Rainfall amount -Rainfall duration -Distribution of rainfall over the drainage basin. (2) Phsyiographic factors (e.g. watershed) - watershed size -Watershed shape -watershed slope (3) Vegetation - Dense vegetation leads to less run-off while sparse vegetation leads to more run-off. (4) Urban development. - Roads and buildings have do not allow infiltration into the soil. Water will therefore run off directly into the stream, at a very fast rate and in significant volume.
