Organic matter accumulated from grassland vegetation has played a major role in creating the fertile soils of the central U.S
True False
Indicate whether the statement is true or false
T
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A comet's tail results from the increased speed that a comet attains as it nears the Sun, leaving some particles behind because of the acceleration of the main mass of the comet.
Answer the following statement true (T) or false (F)
The major adaptions that made it possible for mammals to evolve into their modern forms included all of the following except ________
A) they developed specialized limbs to adapt to a varied life style B) they became significantly larger C) they developed a more efficient respiratory system D) they developed specialized teeth to adapt to a varied diet E) their brains increased in capacity
The three R's of sustainable resource use are recycle, reuse, and reduce.
Answer the following statement true (T) or false (F)
What surface feature is present on Earth above the rising limb of a mantle convection cell?
a. trench b. spreading ridge c. hot spot d. continental mountain chain e. volcanic island arc