Why don't we get an eclipse every month? *

ANSWER:

We don't get an eclipse all period because the Moon's revolution is turned at  approximately 5∘ to the ecliptic.

EXPLANATION:

If the Moon's revolution was in the equal level as the Earth's we would encounter two  eclipses all period. A solar eclipse would appear every new moon also a lunar eclipse  would appear every full moon. As the Moon's orbit is turned at 5∘ to the ecliptic, an  eclipse can simply happen when the Moon is near one of its links which are the points  where the Earth and Moon circles intersect. The line joining the links also has to be  facing towards the Sun.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3