Oil and natural gas
There three main natural sources of hydrocarbons: natural gas, petroleum and coal.
Natural sources for americium doesn't exist.
it effect because it is desert
it is pretty obvious oil, natural gas, & chrome
they are both natural sources of energy
natural energy sources
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,
one natural resource is the sun
The sun
Cinchona