When something cannot be directly observed, it can be represented by a?
A. hypothesis
B. model
C. graph
D. theory
Answer: B. model
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Which characteristic of Venus is NOT due to the runaway greenhouse effect?
A. thick lava that creates pillow-shaped domes B. clouds that completely hide the surface C. a very slow rotation rate D. surface temperatures that are higher than Mercury's
Which of the following explains why we see different constellations at different times of year?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
The average temperature over the past 1000 years has been about 15?C?C. From the graphs, you can conclude that Earth's average temperature during the past 800,000 years has
A. varied between about 7?C and 19?C B. stayed remarkable steady, never varying by more than about 2?C C. never been as high as it is today D. varied between about ??10?C and +4?C
A quantum of electromagnetic radiation is a
a. wave function. b. photon. c. de Broglie wave. d. laser. e. hologram.