Weegy: Our climate has been in change since the planet formed... long before the first humans appeared.
Volcanic outgassing and gas particles from space collected to form our atmosphere.
Life began taking in some gasses and letting out others. [ This changed the ph of oceans and the gasses left over for life to use.
On occasion, a large object will hit the earth or a large volcano will erupt, spreading ash and causing large areas to ... (More)