What type of ocean wave has a disturbing force of sudden changes in atmospheric pressure?
A) Seiche waves
B) Capillary waves
C) Wind waves
D) Tidal waves
A
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Identified deposits from which we can extract the minerals profitably at current prices are referred to as ____.
A. placers B. estimates C. deposits D. resources E. reserves
Most human-made impurities found in the atmosphere present a health and environmental hazard. These are called
a. ?nutrients. b. ?pollutants. c. ?aerosols. d. ?dust. e. ?particles.
What was the initial motivation for European involvement in commerce with Africa?
a. African cotton b. large number of African purchasers for European products c. slavery d. abundant African mineral resources e. access to African timber
The first aerial photographs were taken ________
A) in the middle 1800s B) during World War II C) during the Vietnam War D) during the Korean War E) in the middle 1600s