Explain why oxygen-breathing equipment would be needed in mesospheric air even though it contains the same composition of gases that is found at the earth's surface
The air in the mesosphere is extremely thin and the atmospheric pressure is quite low. Even though the percentage of nitrogen and oxygen in the mesosphere is about the same as it is at Earth's surface, a breath of mesospheric air contains far fewer oxygen molecules than a breath of tropospheric air. At this level, without proper oxygen-breathing equipment, the brain would soon become oxygen-starved-a condition known as hypoxia-and suffocation would result.
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In a ________ plate boundary, lithosphere is neither created nor destroyed. Fill in the blank(s) with the appropriate word(s)
In 1959, the water stored behind Hegben Lake Dam in Montana began to slosh violently back and forth in a series of oscillating waves. These seiches were caused by ________.
A. a freight train plunging off a track and into the lake B. the collapse of the dam C. a large landslide into the lake D. a small meteor crashing into the lake E. a sudden drop of the lake bottom during an earthquake
How often does a sea breeze circulation reverse direction and become a land breeze?
A. once every few days B. once per day C. at the beginning and the end of the summer D. several times per day
Of the ions Cl-, Na+, NH4+ and NO3-, which will move towards the cathode?
A) only chloride ions B) only sodium ions C) both chloride ions and nitrate ions D) both the sodium ion and ammonium ions