What conditions are necessary to maintain an ocean of liquid water permanently? Why is having a liquid ocean so important?
· The movement in a nearly circular orbit around a stable star is needed.
· The distance from the star is important. It has an effect on the temperature. If a planet is too close to a star, it may only be able to sustain water vapor. On the other hand, a planet that is too far away from the star will only be able to sustain solid ice.
· There can only be a single star that it is orbiting to ensure the consistency of the temperature. Multiple stars could cause intense periods of heat or cold.
· Materials on the planet must be present to form a solid crust in addition to water.
· The planet must be large enough to ensure its gravity will keep the ocean and atmosphere from meandering into space.
· The presence of an ocean is vital for the formation of life. This is likely the place on Earth where life began.
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Why is productivity low in tropical regions?
A) because the deep waters are too warm to maintain a healthy biomass B) because the thermocline acts as a barrier to the mixing of surface and deep waters C) because there is too much sunlight D) because the low density of the water makes it hard for plankton to float near the surface E) All of the above are problems.
Why does India have so many distinctive regional filmmaking industries?
What will be an ideal response?
The most important component of metamorphic processes is:
a. heat b. pressure c. aqueous solutions d. depth
For most streams, bank full discharge occurs
A) daily. B) about once per month. C) about once every 2 years. D) about once every 75 years.