Langkah langkah untuk mengurangkan kesan negatif terhadap bentuk muka bumi

Which factors add to the greenhouse effect and are caused by human activities?

What causes heat transfer in fluids

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.