Exam 1: Earth and Its Atmosphere
If the air temperature at the surface (0 feet) is 60 F, what would be the approximate air temperature at an altitude of 10,000 feet, assuming an average atmospheric lapse rate of 3.6 F per 1000 feet?
The approximate air temperature would be 24 degrees Fahrenheit.
How has the composition of Earth's atmosphere changed over time? Briefly outline the evolution of Earth's atmosphere.
Earth's first atmosphere (some 4.6 billion years ago) was most likely hydrogen and helium-the two most abundant gases found in the universe-as well as hydrogen compounds such as methane and ammonia. A second, more dense atmosphere gradually enveloped the Earth as gases from molten rock within its hot interior escaped through volcanoes and steam vents. We assume that volcanoes spewed out the same gases then as they do today: mostly water vapor (about 80 percent), carbon dioxide (about 10 percent), and up to a few percent nitrogen. As millions of years passed, the constant outpouring of gases from the hot interior (outgassing) provided a rich supply of water vapor, which formed clouds. Rain fell upon the earth for many thousands of years. Large amounts of CO2 were dissolved in the oceans. The atmosphere gradually became rich in nitrogen (N2). Oxygen (O2), the second most abundant gas in today's atmosphere, probably began an extremely slow increase in concentration as energetic rays from the sun split water vapor (H2O) into hydrogen and oxygen during a process called photodissociation. Hydrogen, being lighter, likely rose and escaped into space while the oxygen remained in the atmosphere. After plants evolved, the atmospheric oxygen content increased more rapidly, likely reaching its present concentration several hundred million years ago.
The difference in atmospheric density is greatest in the layer bounded by
Describe some of the processes that release and remove carbon dioxide from the atmosphere. Is there any evidence that suggests that these processes are not in balance?
Which weather element ALWAYS decreases as we climb upward in the atmosphere?
Which atmospheric layer contains the most mixing and overturning of air?
Weather in the middle latitudes tends to move from east to west.
When applying the scientific method to investigating the atmosphere, scientists study
Fronts are a sharp change in temperature, humidity, and wind direction.
The Sun is surrounded by Earth, and how many other planets?
Earth's atmosphere is divided into named layers based on the vertical profile of
Typically, water vapor occupies about what percentage of the air's volume near Earth's surface?
Soil dust, salt from ocean waves, forest fire smoke, volcanic ash particles, and pollutants are some of the aerosols found in the atmosphere.
Briefly explain the production and natural destruction of carbon dioxide near Earth's surface. Give two reasons for the increase of carbon dioxide over the past 100-plus years.
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