The Milankovitch cycles cannot entirely explain recent global warming trends because:
A) no data have been found to support their influence on Earth's climate.
B) they operate on a very long time scale and cannot address shorter term cycles.
C) they were disproved in the 1980s.
D) they address cycles in precipitation only.
B
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River water contributes which ions to the ocean?
A) ?carbon dioxide and oxygen B) ?hydrogen and oxygen C) ?calcium and bicarbonate ions D) ?nitrogen and carbon dioxide
Several times in the past ________ years, many, or even most, of the species on Earth became extinct in a geologically short time.
A. 541 billion B. 54.1 million C. 541 thousand D. 541 million
The height of an electromagnetic wave is its
A. frequency. B. wavelength. C. plane of electrical component. D. amplitude.
The primary reason polar bear population are declining is the lack of food, since their prey species (seals) habitat is declining
Indicate whether the statement is true or false