Which statement about bird flight is true?
A. Small birds such as sparrows spend most of their time soaring.
B. Bird wings are airfoils that cause air to flow faster under the wing than over the wing.
C. Birds must be within a thermal in order to fly.
D. In order for birds to stay in the air, lift must balance gravity.
Answer: D
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In this grassland ecosystem, where is the most chemical energy located?
A) decomposers B) 1st trophic level C) 2nd trophic level D) 3rd trophic level E) 4th trophic level
If the mantle has a density of 3000 kg/m3 and a section of crust has a density of 2000 kg/m3, what percent of the crust would stick up above the top of the mantle and what percent would stick down into the mantle?
What will be an ideal response?
The low-viscosity, fluid lava of hot-spot volcanoes in ocean basin settings is typically
A. mafic. B. ultramafic. C. intermediate. D. felsic.
More hurricanes form in the South Atlantic and the eastern South Pacific than in any other regions
Indicate whether the statement is true or false