The habitable zone is the area around a star where:
A) planets with life have been found.
B) human beings could live.
C) the Greenhouse Effect is possible.
D) a planet could have an atmosphere.
E) temperatures are suitable for planets to have liquid water.
Question 2Why does detection of abundant free oxygen in an atmosphere suggest life is present? Does its absence prove life could not be present?
What will be an ideal response?
Question 3The Roche lobe of a star in a binary star system:
A) resembles the ear of Edouard Roche, a French mathematician.
B) is, in terms of the star's gravity, its zone of influence.
C) is the part of a rapidly rotating star that will eventually spin away to form planets.
D) is the accretion disk around the companion star.
E) leads to formation of rings, like around the jovian planets.
Question 4In noting that our world is differentiated, we mean that
A) the density of its materials decreases as you go downward toward the core.
B) the Earth has evolved in a different pattern than any other planet.
C) the iron and nickel core is denser than the silicate mantle and crust.
D) radioactive heating in the core is at a slower pace than when the Earth was new.
E) the Earth's magnetic field is different now in polarity than it was 700,000 years ago.
Question 5In the process of planetary formation, when would the inward migration of Jupiters have most likely occurred?
A) shortly after all of the planets had finished forming
B) just after the system was cleared of the remaining gas
C) before these planets had grown to full size
D) after these planets had reached full size, but before terrestrial planets had finished forming
E) at least hundreds of millions of years after planetary formation ended
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