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April 30, 2017 8th period Reta Curtis

Across
is a scatter graph of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their spectral classifications or effective temperatures
states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed
is the rate of change of velocity of an object
Down
consists of a very small nucleus composed of protons and neutrons which is encircled by moving electrons
the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon, Sun, and rotation of the Earth
is the International System of Units