Caliche is a ____
A)layer of silica cement within a pedalfer
B)layer of precipitated calcium carbonate in horizon B
C)layer of rock between soil layers C and D
D)deposit formed in alkali soils
E)light colored layer of unstable minerals
B
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The Jewish calendar
A) does not have a leap year. B) has nineteen months. C) is completely out of sync with the seasons. D) is based on the lunar cycle. E) features holidays based on the life and death of Jesus.
Ozone is important to humans because it ________
A) reflects solar rays that would cause global warming B) absorbs infrared radiation which is harmful to humans C) absorbs ultraviolet radiation with is harmful to humans D) passes solar rays that would maintain our present climate range E) is a pollutant that is harmful to humans
In grams of carbon per square meter per day, the open-ocean environment is as productive as a tropical rainforest.
Answer the following statement true (T) or false (F)
Which of the following contains two species which have the same mass number?
A) 14C, 14N B) 12C, 13C C) both a and b D) neither a nor b