As we look at larger and larger scales in the universe, we find
A) a larger and larger percentage of the matter is dark.
B) almost exclusively visible matter.
C) a larger and larger percentage of the matter is visible.
D) smaller and smaller masses.
E) an equal amount of visible and dark matter.
A
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Enzymes are an example of__________
A) minerals B) carbohydrates C) vitamins D) proteins
Heating from _________ causes the top of Earth's stratosphere to be warmer than the bottom.
a. higher-energy particles in the solar wind b. convection c. the ozone layer absorbing UV light d. charged particles trapped by magnetic fields e. the greenhouse effect
In contrast to Aristotle's way of explaining nature, Galileo relied on
A) experiment. B) logic. C) patterns. D) mathematics.
A "burning glass" used to concentrate sunlight in a tiny spot is a
A) converging lens. B) diverging lens. C) either of these D) neither of these