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☆☆☆☆☆EDITED 1/8/16: A contour interval is a the elevation difference between two adjacent contour lines.
Previous person put some ridiculous answer. This one is the correct answer on APEX and does not need improvement.
a plant releasing water vapor.
astronomy
No the US is in the Norther Hemishere.
plants takes in carbon dioxide and release blank gas?
Draw conclusions based on results.
As water is cooled its density increases until it reaches about 4 C and then it decreases.
If a scientist makes an educated guess that diabetes is caused by genetic factors then his guess is an example of a hypothesis. He can then go and test his hypothesis.
Elevation
It is the hottest planet, and it is very rocky with many craters. It is terrestial and the closest to the sun and also the smallest planet.
Meteorologist
Up to 2 low-tides. It depends upon the alignment of the Sun and the Moon, the tides, the state of the ocean and the shape of the coastline. Some areas are semi-diurnal, with two high tides and two low tides. Other areas can receive a mixed tide, which is one low tide and one high tide per day.
Horizon
