Carcinogens cause or promote ____.
A. genetic defects
B. birth defects
C. cancer
D. immune system disorders
E. allergic reactions
Answer: C
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Metamorphic rocks melt and recrystallize.
Answer the following statement true (T) or false (F)
Jet streams are found within the ____
A) thermosphere B) tropopause C) stratopause D) exosphere
Continental crust is formed by ________
A) recycling of material in giant lava lakes in the early earth history B) plumes of hot igneous material that rise from the core-mantle boundary to form hot spots C) partial melting of mantle rocks D) melting and differentiation of oceanic crust at subduction zones E) the original planetary accretion that also led to the formation of the earth's other layers
What do urea-formaldehyde foam insulation (UFFI), lead-based paint, and asbestos have in common?
a. they all pose a risk to humans because they may emit harmful gases b. they all were banned in 1978 c. all three were used in insulating materials d. they were all used at one time in residential construction