A contact between parallel sedimentary rock that records missing geologic time is
A. a sedimentary contact
B. an angular unconformity
C. a nonconformity
D. a disconformity
Answer: D
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Climatic models predict that the concentration of a certain gas must increase in the atmosphere for CO2 to produce a global warming of between 2°C and 5°C. According to this prediction, which of the following gases must increase?
A. chlorofluorocarbons (CFCs) B. water vapour (H2O) C. sulfur dioxide (SO2) D. ozone (O3)
Why is the percentage of a country's labor force engaged in agriculture an important indicator of the level of development?
What will be an ideal response?
Tornadoes are most often generated along the ________ front of a middle-latitude cyclone
Fill in the blank(s) with correct word.
The number of active "hot spots" on Earth over the last 10 million years active is ________.
A. more than 100 B. about 20 C. about 50 D. only 4 E. no more than 10