38 total questions (5 free)
Which of the following is an example of physical weathering?
Correct Answer: A
Rationale: Physical weathering breaks rocks without changing their chemical makeup. Choice A, rock cracking from freezing/thawing water, is physical as water expands in cracks, exerting pressure. B is erosion/transport, moving material, not breaking rocks. C is deposition, sediment buildup, not weathering. D is chemical weathering, acid altering statue's composition. Physical vs chemical: former mechanical, latter involves reactions.
Which THREE of the following are considered sources of freshwater?
Correct Answer: A,B,D
Rationale: Freshwater has low salts. A: Rivers are flowing freshwater. B: Aquifers store underground freshwater. D: Glaciers are frozen freshwater. C: Oceans are saltwater. Sources must be low salinity; oceans high salt exclude them.
Of the following, which has Earth completed when it makes one revolution around the Sun?
Rationale: Earth year is one Sun revolution, ~365 days. B: Day is axis rotation, 24 hours. C: Light year is distance, not time. D: Lunar month is Moon phases, ~29.5 days. Revolution defines orbital period.
Which of the following is a statement that proposes a possible explanation for a phenomenon and can be tested through experimentation?
Correct Answer: D
Rationale: Hypothesis is testable explanation. A: Observation is sensory data. B: Variable is changeable factor. C: Experiment tests hypothesis. Hypothesis key in scientific method for predictions.
Which THREE of the following processes depend directly on energy from the Sun?
Correct Answer: B,C,D
Rationale: Sun drives many processes. B: Water cycle via evaporation. C: Photosynthesis uses sunlight. D: Circulation from uneven heating. A: Spreading from internal heat. Solar energy essential for surface processes.
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