Which of the following represents the most intense karst development?
a. sinkholes
b. disappearing streams
c. haystack hills (hums)
d. columns
d
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Global warming is going to cause severe droughts all over the world.
Answer the following statement true (T) or false (F)
The most important barriers to diffusion today are physical features of Earth's surface
Indicate whether the statement is true or false.
The last glacial advance peaked in North America about ____ years ago
a. 150 b. 3,000 c. 18,000 d. 100,000 e. 2.6 million
In contrast with the ________, the soil of the ________ is more nutrient-rich and this type of biome has fewer insects, parasites, and fungal diseases. Therefore, in many places, these areas are highly endangered.
A. Tropical seasonal forest; tropical rainforest B. Tropical rainforest; tropical seasonal forest C. Temperate grasslands; tropical seasonal forest D. Boreal forests; tundra E. Grasslands; boreal forests