Isotopes are atomic nuclei that are radioactive.
Answer the following statement true (T) or false (F)
False
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An average temperature of above freezing but below 50°F during the warmest month is characteristic of a ____
A) region in which savanna grass thrives B) tundra C) taiga D) region with a lack of vegetation
Instructions: Choose one answer from each pair of selections. Humid air is slightly MORE | LESS dense than dry air with the same temperature
What is the ultimate source of food for animals living around deep-sea hydrothermal vents?
A. bacteria that break down hydrogen sulfide B. sunlight and photosynthesis C. the decay of creatures that float on the ocean surface and settle to the bottom D. nuclear energy from the heated uranium-rich rocks
Which of the following is a point source of pollution?
a. acid deposition b. urban streets c. oil tankers d. suburban lawns e. parking lots