<span>The answer is Due to heating of the air by the engine exhaust. Contrails are formed when the hot exhaust of the plane engines is rapidly cooled by the cold air in the upper atmosphere. The water vapor in the engine exhaust, formed in the combustion of fuel, freezes immediately to ice crystals due to the low pressure and -36oC temperatures in the 8000 m altitude in which the planes cruise. </span>
Answer:
The answer is "species richness."
Explanation:
It is a term that relates to the amount of species in a environment, and also has to do with measuring the diversity of a species in a community.
Answer:
C
Explanation:
all of them have negative effects on the enviroment as a whole but C gives no reason why it would be a consequence
Answer:
Veins
1l carry blood from tissue of the body to the heart
2) are usually found closer beneath the skin
3) are less muscular then arteries
4) collapse if blood flow stops
arteries
1) carry blood back away from the heart to the tissue of the body.
2) found deeper within the body
3) are more muscular then veins
4) would generally remain open even if blood stops because of it's muscular structure.
The southerly lowlands of the island average around 0 °C<span> (</span>32 °F) in winter, while the Highlands of Iceland tend to average around −10 °C<span> (14 °F). The lowest temperatures in the northern part of the island range from around −25 to −30 °C (−13 to −22 °F). The lowest temperature on record is −39.7 °C (−</span>39.5 °F<span>).</span>