The Apollo astronauts brought ________ rocks back to the Earth.
A. comet
B. asteroid
C. Mars
D. Venus
E. moon
Answer: E
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A. corona B. tangent arc C. sun pillar D. rainbow
A rainstorm can trigger the landslide of an unstable slope. Indicate whether the statement is true or false
The key to successful and sustainable waste management involves many stakeholders, community support, and excellent management. What is important for all these things to work together?
A. landfill B. recycling C. composting D. education
Limestone is formed primarily through ________
A) evaporation of calcite rich seawater B) biochemical sediments secreted by marine organisms C) chemical interactions between ocean bottom sediments and ions in sea water D) direct precipitation from seawater