What percentage of the known naturally occurring isotopes is radioactive?

What will be an ideal response?


70/339 * 100 = 20.6%

Environmental & Atmospheric Sciences

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The only major group of species that has escaped increasing extinction threat are the primates, where less than 10% are currently threatened with extinction.

Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences

What is the dominant type of weathering is shown in this photograph?

A. chemical weathering B. physical weathering C. hydrolysis D. debris flow E. dissolution

Environmental & Atmospheric Sciences

There appears to be a _______ of photosynthesis and respiration currently, so the remarkable atmosphere is best understood as a result of the long term _______ of organisms in the ocean and on land.

Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

Where does the largest amount of upwelling occur?

a. Equatorial upwelling b. Polar upwelling c. Coastal upwelling d. Mid-latitude upwelling

Environmental & Atmospheric Sciences