Which of these would be caused by a chemical change? A)
The formation of lava.
B)
Sedimantary rock layering over time,
C)
Metamorphic rock forming from igneous.
D)
Metamorphic rock eroding to form sedimentary rock.

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?