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 some 4 billion years ago.
B) Ozone is a form of oxygen.
C) Ozone absorbs harmful ultraviolet light from the Sun.
D) Without this ozone, Earth would not have a stratosphere.
A) The presence of ozone was crucial to the origin of life some 4 billion years ago.
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What causes auroras?
A. particles from the Sun colliding with and exciting atoms in our upper atmosphere B. waves in the magnetic field creating an upper atmospheric laser-like effect C. micro meteorites burning up as they sweep along Earth's magnetic field D. fluorescence by upper atmospheric hydrogen atoms E. sunlight reflected off meteor dust high in the atmosphere
The mass range for neutron stars is
A) 0.08 to 0.4 solar masses. B) 0.4 to 3 solar masses. C) 1.4 to 3 solar masses. D) 3 to 8 solar masses. E) 6 to 11 solar masses.
If the velocity potential in an inviscid flow is given by ? = Ay , where A is a constant, the stream function is:
A(n) ____ is 1/60th of a minute of arc
a. precession b. second of arc c. degree d. nadir e. angular diameter