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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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
The clouds of Venus are much higher in its atmosphere than are those in our troposphere
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%