Around 4 billion years ago Venus could have been more Earth-like with liquid water on its surface because
A) Venus has a protective magnetic field
B) its atmosphere was thinner
C) Venus was farther from the Sun
D) the Sun was dimmer so Venus would have received less radiation
D
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The elements in the periodic table that have completely filled shells or subshells are referred to as
A) alkali metals. B) transition elements. C) noble gases. D) halogens.
________ occur about 130 km above Earth's surface near the polar regions when energy in the solar wind guided by Earth's magnetic field excites gases in the upper atmosphere
a. Coronas b. Flares c. Auroras d. Coronal holes e. Nuclear fission
For a tidal energy device, bigger tidal range is better
What will be an ideal response?
Compound Microscope: A compound microscope has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm. It is adjusted for minimum eyestrain for persons with a near point of 25 cm. If the two lenses are separated by 40.0 cm, what is the total overall magnification?
A. 28 B. 56 C. 470 D. 550 E. 2200