Why would it be difficult to land a spacecraft on Jupiter?
A. Jupiter's intense magnetic field would destroy it.
B. The clouds are so thick it would be hard to navigate to a safe spot.
C. Jupiter's immense gravity would squash it.
D. Jupiter has no solid surface.
Answer: D
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What is the typical depth of light penetration in the open ocean?
a. 40 meters b. 100 meters c. 330 meters d. 600 meters e. 800 meters
Strain refers to a change in shape of a rock, and therefore, strain is caused by stress.
a. true b. false
Bioaccumulation is ________
A) the process by which chemicals are stored in the tissues of living organisms B) the chemical change that occurs when substances alter the growth and development of humans C) average length of time a molecule of a substance spends in the environment D) the total amount of chemicals stored in the tissues of living organisms E) the chemical change that occurs when substances are altered by the sun or metabolized by microorganisms
In the last 20 years geologists have begun measuring accumulation of Helium (He) in some minerals because these minerals can retain He at temperatures up 100-200°C. The "date" gives a time when the material cooled below the temperature where the helium began to be retained, which is related to the depth of the material. Where do you think the He comes from that allows this technique to work?
A) alpha decay of some radioactive element B) beta decay of some radioactive element C) the sun D) the atmosphere, like carbon-14