Match the definition with the correct term: resistance to flow.

friction

gravity

resistance

viscosity

match the definition with the correct term: igneous rock formations created when magma does not reach earth’s surface, but cools and solidifies inside the crust.

hot spot

magma

volcanism

pluton

match the definition with the correct term: funnel-shaped pit at the top of a volcanic vent.

fissure

crater

rift

trench

match the definition with the correct term: type of coastline that forms when land rises or sea level falls.

lagoon

estuary

barrier island

emergent

match the definition with the correct term: crack through which lava flows to earth’s surface.

fissure

trench

vent

rift

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

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.