A recently recognized potential health hazard for coal miners is
A. pockets of gas that could result in explosion.
B. mine subsidence.
C. breathing of dust that could result in black lung disease.
D. breathing radon that is radioactive which may increase the incidence of cancer.
Answer: D
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Nebular theory pertains to the formation of
A) the solar system. B) a galaxy. C) the asteroid belt. D) the Earth.
This is the world's largest soil order, occurring on 19% of Earth's land surface in the world's dry regions
A) Oxisols B) Andisols C) Mollisols D) Aridisols
A tropical cyclone in the northern hemisphere rotates ________ and has a storm track turning ________.
A. counterclockwise; south and southeast B. clockwise; north and northeast C. counterclockwise; north and northeast D. clockwise; south and southeast
Directly above the Earth's equator lies the ________ in the sky.
A. ecliptic B. north celestial pole C. south celestial pole D. celestial equator