<span>In terms of matter and resources, the Earth is essentially a closed system, because matter and resources are fixed.
</span>In terms of energy, the Earth is an open system, because there is a balanced transfer of energy. (The energy<span> radiates into the </span>Earth's system<span>, from the Sun and</span><span> then it is radiated back into space from the </span>Earth. The<span> flows of energy are regulated by the </span>Earth's<span> atmosphere and ozone layer.)</span>
Instead, they packed the earth, which is rich in clay, into thick walls that provided insulation from the hot summers and cold winters.
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hope that helped :)
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just read this from khan academy says we need to be on the lookout for when we, too, become used to the casual oppression of others, when our everyday compassion for people different from us disappears
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75% more than 450 volcanoes
