One environmental risk factor for skin cancer is
A. infection by certain viruses.
B. exposure to ultraviolet light.
C. diet.
D. exposure to X-rays.
Answer: B
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____________ provides educational and clinical services to help couples choose how many children to have and when to have them.
Fill in the blank(s) with the appropriate word(s).
What prevents North Atlantic Deep Water from moving on a large scale like the Antarctic Bottom Water?
A) The density of the water B) The topography of the basin C) The composition of the sediments D) The salinity of the water
Human activities that can significantly contribute to shoreline erosion include ____
A) building sand dunes near the backshore to protect property B) importing sand to beaches from offshore C) placement of seawalls along the shoreline D) excess fishing and boating activities
The exosphere marks the outward limit of the ________
A) troposphere B) stratosphere C) atmosphere D) thermosphere E) geosphere