Which of the following is a major factor in human population increase in the last 200 years?
a. Humans have developed the ability to expand into almost all of the planet's climate zones.
b. Early and modern agriculture has allowed more people to be fed per unit of land area.
c. Improved health and sanitation has lowered the death rate.
d. All of these are correct answers
e. Only two of these choices are correct answers
D
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Australia has always maintained an "open-door" policy to immigrants from Asia and the Middle East
a. True b. False Indicate whether the statement is true or false
The _______________ layer in the upper atmosphere protects us by blocking much of the sun's harmful ultraviolet (UV) radiation, which causes ski cancer and cell mutations
Fill in the blank(s) with correct word
Science is an approach to studying the supernatural world that involves formulating hypotheses and then testing them to see if the hypotheses are supported or refuted.
Answer the following statement true (T) or false (F)
Crevasses (deep fractures or cracks) form because ________
A) as the glacier moves over irregular topography, cracks can form anywhere in the glacier but they are called "crevasses" only if they are near the surface B) not all of the ice in a glacier moves downhill at the same rate in the glacier C) as the glacier moves over irregular topography the bottom of the glacier (known as the zone of fracture) cracks and the cracks propagate upward to the surface of the glacier D) there is not always the same amount of ice available in all areas so cracks form when the ice tries to move and fill in empty parts of the glacier E) as the glacier moves over irregular topography, the brittle upper layer or zone of fracture is subject to tension and cracks above the ductile layer