El Nio is a shift in the circulation in the Pacific Ocean that occurs every year in December.
a. true
b. false
Answer: b. false
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The estimated sex ratio at birth for 2014 is ________ boys born for every 100 girls
A) 105 B) 107 C) 110 D) 120
The radius of the Earth's core is 3486 km and the thickness of the mantle, which surrounds the core, is 2900 km. Therefore, the volume of the mantle is ___ the volume of the core.
Fill in the blank(s) with the appropriate word(s).
List two differences between simple polygons and regions.
What will be an ideal response?
When El Niño occurs every three to five years, a mass of warm Pacific water that is usually pushed westward by trade winds
A. Surges back eastward toward South America B. Becomes much warmer than usual, strengthening trade winds C. Surges northward toward Japan D. Cools dramatically E. Sinks and therefore cools substantially