Thick bars of gravel and large boulders provide evidence for massive flooding cause by the failure of large pluvial and
proglacial lakes.
a. True
b. False
True
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To maintain steady total populations in future decades, most European countries will need to
A) decrease fertility rates. B) increase their total fertility rate and/or accept more immigrants. C) encourage emigration. D) encourage the use of birth control.
When a mid-latitude cyclone forms and moves along the polar front in a wave-like manner, the developing storm is referred to as a(n) ____
A) frontal wave B) wave cyclone C) open wave D) stationary front
The textbook uses many climographs. Climographs are useful in ________
A) predicting weather B) classifying climate C) recording relative humidity D) judging the strength of storms E) calculating climatic change
Which of the following best describes the role of biological activity in soil development?
A) Plant roots provide channels for air and water movement in soils. B) Broadleaf trees tend to increase the alkalinity of soil, whereas needleleaf trees increase the acidity. C) Earthworms increase soil porosity and contribute to soil movement and organic content. D) All organisms living in, on, and over the soil, influence soil development and characteristics: they can influence the pH, the organic matter, chemical content, and biological content of soils.