Susan Solomon led the scientific expedition that
A) measured the rate of temperature increase at isolated places on earth, such as the north pole and the Gobi desert.
B) studied the problem of ozone depletion over Antarctica.
C) measured the carbon-dioxide content of the atmosphere at many places on Earth.
D) measured the ozone content of the upper atmosphere at many places above the surface of the earth.
E) studied in detail the atmospheric effects (especially carbon-dioxide injections) of large active volcanoes.
B
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Which of the following statements about ozone (in Earth's stratosphere) is not true?
A) The presence of ozone was crucial to the origin of life. B) If the ozone layer is depleted, we can expect the rate of mutations in land-based life-forms to increase significantly. C) Ozone absorbs ultraviolet light from the Sun. D) The human-made chemicals known as CFCs can cause a loss of ozone in the atmosphere.
The slope of a distance vs. time graph is the acceleration
a. True b. False Indicate whether the statement is true or false
A tall crate and a short crate (both rectangular and of similar construction) of equal mass and equal base size are placed side by side on an incline, without touching each other. As the incline angle is increased, which crate will topple first?
1.the tall crate 2.the short crate 3.Both will topple at the same time. 4.It is impossible to tell, they will topple differently every time.
Energy in Capacitors: An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates. If the separation between the plates is now doubled, the amount of electrical energy stored on the capacitor will
A. double. B. quadruple. C. be cut in half. D. be cut in fourth. E. not change.