Initial Number of
Protons
Element(s)
and Particles
(if applicable)
Number of
Neutrons
Number of
Protons
Total Mass
of
Reactants
Number of
Neutrons
Total Mass
of
Products
Element(s)
and Particles
(if applicable)
Lead
a particle
Alpha
decay
Polonium
Neon
Beta-plus
decay
Sodium
Beta-
minus
decay
Positron
Magnesium
B particle
Sodium
Nickel
Gamma
radiation
Cobalt
Y radiation
B particle
Barium
Uranium
Fission
Krypton
Neutrons
Neutron
Deuterium
Helium
Fusion
Neutron
Tritium

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

The three types is stress that act on earths rocks are compression, tension, and