Why does Earth have an ultraviolet-absorbing stratosphere, while Venus and Mars do not?
What will be an ideal response?
Life and oxygen also explain the presence of Earth's ultraviolet-absorbing stratosphere. In the upper atmosphere, chemical reactions transformed some of the O2 into molecules of O3, ozone. The ozone molecule absorbs solar ultraviolet energy better than O2, creating the warm stratosphere. Since Mars and Venus lack photosynthetic life, they have too little O2 and too little ozone to form a stratosphere.
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There is an induced emf in a wire that is moving parallel to a magnetic field if the wire is moving in the opposite direction to that of the magnetic field
Indicate whether the statement is true or false
The process in which one plate bends and descends beneath another plate is called
A) subduction. B) seduction. C) segregation. D) sinking.
The switch in the figure is closed at t = 0 when the current I is zero. When I = 15 mA, what is the potential difference across the inductor?
a.
240 V
b.
60 V
c.
0
d.
180 V
e.
190 V
The volcano Olympus Mons on Mars is
A) taller than Mt. Everest and as large as the state of Arizona B) smaller than Mt. Everest but as large as North America C) taller than Mt. Everest and but only as large as the Big Island of Hawaii D) about the same height and size as Mt. St. Helens in Washington State, USA