Oxygen is supplied to the atmosphere by
a. ozone.
b. incomplete combustion.
c. photosynthesis.
d. complete combustion.
c
Physics & Space Science
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Nuclear Reactions: In the fission reaction 235U + 1n ? 141Ba + 92Kr + x 1n, what is the number x of neutrons produced?
A. 0 B. 1 C. 2 D. 3
Physics & Space Science
One mole of the carbon-12 isotope contains 6.022 × 10^23 atoms. What volume in m3 would be needed to store one mole of cube-shaped children's blocks 2.00 cm long on each side?
a. 4.8 × 10^18 b. 1.2 × 10^22 c. 6.0 × 10^23 d. 1.2 × 10^24 e. 4.8 × 10^24
Physics & Space Science
Soil that is high in humus is usually what color?
What will be an ideal response?
Physics & Space Science
The Local Group of galaxies is dominated by the presence of spiral galaxies
Indicate whether the statement is true or false
Physics & Space Science