Q: Weather forecasts are more accurate today than in the past due to OPTIONS:
- global warming
- air-quality control
- plate tectonics
- use of images from space
A: use of images from space

Which of the following is a characteristic of all chemical changes?
OPTIONS:
- A different state of matter is produced.
- Some mass is converted to energy.
- Some form of light is given off.
- A new material is formed.

A new material is formed.

Q: Many areas of Massachusetts have small deep ponds called kettle ponds. Which of the following best explains the formation of these ponds? ---- OPTIONS:
- avalanche
- wind erosion
- glacial depression
- sediment deposition

A: glacial depression

Which of the following devices relies on electromagnetic radiation in the radio wave region of the spectrum for operation?
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OPTIONS:
- sun tanning lamp
- electric light bulb
- cellular telephone
- electric toaster

cellular telephone

Question:
Which is the best example of a pure substance?
OPTIONS:
- peanuts
- milk
- gold
- air
Answer:
gold

Question:
Many cells have a nucleus that contains chromosomes. These chromosomes carry genes that are composed of
OPTIONS:
- hormones
- DNA molecules
- minerals and water
- undigested food molecules
Answer:
DNA molecules