The sun (solar energy)
The Earth (geothermal) this can also be known as internal
The Indo-European tribe called the Aryans invaded and conquered the Indus Valley Civilization, but many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change.
The type of roch that makes up the andes mountains in south america are called igneous rocks
The biggest doubling time of all the regions/continents in the world has Europe.
Europe is the only continent that has almost 0% population growth (as of 2014), which practically means that with this pace Europe will need an eternity to be able to double its population, so it makes it the continent with the biggest time needed to double it's population.
Adobe is a building material which is from earth and organic materials. Adobe is one of the earliest building material used on the world. The Pueblo peoples of the American Southwest built homes out of adobe, sun-dried earth made from sand, clay, water, and organic matter. This is an example <span>of the concept of cultural landscape.</span>
