Natural sources : sun, firefly Artificial sources: oil lamps, tube lights
Daylight, sunlight and skylight or all natural sources of light.
The difference between natural and artificial sources of light is that natural sources are produced by the sun while artificial light sources illuminate using energy from other sources and include incandescent bulbs.
Natural sources of green house effect includes volcanic eruptions,
Any of the fossil fuels (coal, oil and natural gas), as well as uranium (nuclear energy).
Natural sources for americium doesn't exist.
Natural sources : sun, firefly Artificial sources: oil lamps, tube lights
starsfireflieslightningfire
Volcanic ash
Americium is an artificial element, a natural source doesn't exist.
Some natural recourses of NH are forest, tree's, and grasslands.
Daylight, sunlight and skylight or all natural sources of light.
wind mill
There are some natural sources of water available. Three of them are lakes, water tanks, and springs. Water is necessary for the survival of both humans and animals.
firefly etc or hot spring
There three main natural sources of hydrocarbons: natural gas, petroleum and coal.
The fossil fuels are coal, oil and natural gas.