How do air masses cool and warm without removing or adding heat energy to it?
Air masses can cool by expanding, and warm by contracting. Near Earth's surface, air is packed densely by its own weight. Air lifted from near sea level to a higher altitude is subjected to less pressure and will expand. Air becomes cooler when it expands. The opposite effect is also true. Air compressed becomes warmer. Air descending from high altitude warms as it is compressed by higher atmospheric pressure near Earth's surface.
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What group includes infectious germs, and purifies water by breaking down wastes, decomposes organic wastes into nutrients, and provides much of the world's oxygen?
A. carnivores B. autotrophs C. abiotics D. microbes E. herbivores
Which of the following is allowed to be used on farms that want 100% organic certification?
A. fertilizers B. genetically engineered seeds C. synthetic growth hormones D. antibiotics
If an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? What is the name of this element?
A. atomic mass, 99 amu; radon B. atomic mass, 99 amu; technetium C. atomic mass, 137 amu; barium D. atomic mass 142 amu; einsteinium
Asia and the North American continent have been connected by a land bridge at various times during the past. When was the Bering land bridge most recently exposed? Did this coincide with a warm or cool climatic period?
What will be an ideal response?