<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>
B) broad, semiarid plains
Answer:
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Explanation:
The <u>tilt</u> of the moon/earth causes the sun to appear in the sky at a slightly different spot every day
D. Coal.
Coal is the most abundant fossil fuel. It is found most abundantly in the United States of America. It was said that coal reserves can are around 909 billion tonnes, which sustaining the same rate of usage, can be used for more than 100 years.
Global life expectancy is the number of years people live on average in the entire world i believe
