A science teacher who was teaching a unit on minerals modeled mineral formation for the class. She heated granular sugar and a very small amount of water in a pan until the sugar melted and boiled. After a few minutes, she poured the mixture out into a pan, and the mixture took the shape of the pan and hardened. As it hardened, the sugar molecules in the mixture formed crystals.

Minerals that might form in the igneous environment the teacher modeled include
A.
magnetite and quartz.
B.
calcite and epidote.
C.
gypsum and feldspar.
D.
halite and feldspar.

Magnetite and quartz

Explanation:

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.