Q: The pull of gravity on Earth is a direct result of the OPTIONS:
- mass of Earth.
- magnetic field of Earth.
- rotation of Earth on its axis.
- weight of Earth's atmosphere.
A: mass of Earth.

If a neutral atom loses an electron, what is formed?
OPTIONS:
- A gas
- An ion
- An acid
- A molecule

An ion

Q: Which of the following causes a ship's iron anchor to sink to the ocean floor when it is released overboard? ---- OPTIONS:
- chemical forces
- gravity
- magnetism
- nuclear forces

A: gravity

Comparing the skeletons of which of the following fish would best show the evolution of a fish species?
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OPTIONS:
- a male fish and a female fish that could produce offspring
- the same fish just before it received a cut and after it healed
- a fish that lived recently and a fish that lived a long time ago
- the same fish just after it hatched and when it was full-grown

a fish that lived recently and a fish that lived a long time ago

Question:
Water evaporates and falls back to Earth as rain or snow. What is the primary energy source that drives this cycle?
OPTIONS:
- The wind
- The Sun
- Air pressure
- Ocean currents
Answer:
The Sun

*Question*: Solar radiation is a combination of light with different wavelengths. Which type of ray can harm human skin the most? OPTIONS:
- infrared
- microwave
- ultraviolet
- visible
*Answer*:
ultraviolet