What conditions are necessary to maintain an ocean of liquid water permanently? Why is having a
liquid ocean so important? What will be an ideal response?
ANS:Answer
should include:
? 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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The value of total outputs of goods and services in a year in a country is its
A) level of development. B) gross domestic product. C) productivity. D) value added.
The cracking and fracturing of a material subjected to stress is called:
a. Elastic deformation b. Ductile deformation c. Brittle deformation d. Plastic deformation
Rising air is usually associated with a(n) ________ while sinking air is usually associated with a ________
A) trough; ridge B) ridge; trough C) high pressure system; low pressure system D) inversion; neutral atmosphere
How do seismologists know the outer core is liquid?
A) P-waves are refracted upon arrival in the outer core B) S-waves are absorbed upon arrival in the outer core C) both S-waves and P-waves speed up in the outer core D) both S-waves and P-waves slow down in the outer core