The interiors of glaciers are made up of ice that is
A) soft and compact.
B) hard and compact.
C) soft and porous.
D) hard and porous.
Answer: B
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Use the Energy Conversions table to answer the following question: How many calories of energy (c) does a 60-watt lightbulb use in 1 hour?
A) 14.4 c B) 60 c C) 51,660 c D) 861 c
Water vapor is a greenhouse gas that is present at higher concentrations in the atmosphere than CO2. Why then is CO2 considered to be the primary greenhouse gas?
A. Water vapor has a much longer residence time in the atmosphere than CO2. B. Warming is amplified by additions of CO2that decrease the amount of water vapor that the atmosphere can hold. C. Warming is amplified by additions of CO2that increase the amount of water vapor that the atmosphere can hold. D. Lower levels of water vapor drive increases in CO2 concentrations. E. Water vapor concentrations are decreasing while CO2 concentrations are increasing.
________ are topographic "steps" on both sides of a river valley resulting from river entrenchment into its own floodplain
A) Entrenched meanders B) Oxbow lakes C) Nickpoints D) Levees E) Alluvial terraces
Two common requisites for organisms to become fossilized are rapid burial, which protects the remains from scavengers, and possession of hard parts, such as teeth or bones.
Answer the following statement true (T) or false (F)