The mass of 12C is 12 u, where 1 u = 1.660559 × 10^-27 kg. This mass is equal to:
a. the mass of the 12C nucleus plus 6 electrons.
b. the mass of the 12C nucleus plus 12 electrons.
c. the mass of the 12C nucleus.
d. the mass of 6 protons and 6 neutrons.
A
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Indicate whether the statement is true or false
By itself, ________ makes up 70% of the masses of all the planets combined
Fill in the blank(s) with correct word
About what percent of Earth's water is fresh water?
a. 8% b. 18% c. 2% d. 15%
A typical "shooting star" during a meteor shower is caused by a ________ entering Earth's atmosphere.
A) boulder-size particle from an asteroid B) boulder-size particle from a comet C) pebble-size particle from an asteroid D) pebble-size particle from a comet E) microscopic particle of interstellar dust