A wall stands using gravity. It is constantly being pulled down. Many also place them in ways that they dig into the ground, and almost make a socket just for the wall to be placed, using the land that is there. More and more walls are placed and eventually, they make flooring and a roof.
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Yes, many in the Rocky Mountains and Southern and Northern California
Answer:
Technology is the sustainable way to generate tha alternate new sources of energy and suffice the demand of earth's resources.
Explanation:
Coal and firewood is the only conventional sources of energy in the world since Industrial revolution. After introduced modern machineries, oil and natural gas were diggiong out using modern tools but these resources also exhaustable. So many countries and international organisations innovate the new technology and produce the renewable energy in the cost effective manner such as Solar energy, Wind energy, Biofuel and so on, they are not pollute the environment and generate sustainable earth for our future's world.
Answer:
C. Physical
Explanation:
The Rio Grande river is an example of a physical boundary between two countries since it is a landform. Physical boundaries are very diverse and can include oceans, seas, mountains, rivers, and lakes, just to name a few of the many landforms that can make a physical boundary.
A cultural, geometric or religious boundary could perhaps be visible with the right type of map, but a river does not tell us anything about the religious makeup of a certain area, nor does it reflect the cultural of the inhabitants.
The unsuitable factors for forming is '' salt,paints,poisnes substances,etc"
