Atoms of the same element, zinc for example, have the same number of ________
A) electrons in the valence bond level B) electrons in the nucleus
C) neutrons in the outer nuclear shell D) protons in the nucleus
D
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Over millions of years, natural gas and oil can be formed from ____
A) erosion B) volcanic ash C) biogenous sediments D) terrigenous sediments
Approximately ________ cycles of cooling and warming occurred during the last Ice Age
A) 20 B) 15 C) 10 D) 5
Ash eruptions form their own volcanic _______________ as rising ash plumes heat and lift surrounding air
Fill in the blank with correct word.
Which of the following is a positive effect that cities have on the environment?
A) Air pollution from the Midwest and "Rustbelt" states is exported to the northeastern United States and Canada. B) Garbage from New York is distributed to Kentucky to fill up abandoned mines. C) Cities give people places to live with smaller land use. D) Concentrating people in cities contains water and air pollutants, which are removed by greenbelts.