Denver, because if you know that Denver has high thing of that and yeah because awesome so yeah hope helped i not english so sorry.
No, indeed! As you know, plants put out oxygen. When our Earth was a couple of billion years old, water filled the low spots and became the oceans. (Hugely different in location<span> and shape than now). </span>
<span>In those oceans life was created. One of the earliest life-forms was a blue-green algae. Blue-green algae is very much like a plant, and it even put out oxygen. So it was billions or trillions of these tiny algae that produced the first oxygen in Earth's atmosphere. </span>
<span>The ocean today still produces most of the oxygen on Earth.</span>
The level of the oceans' surface is known as the sea level. Sea level is also used to measure the height of certain cities. For example, Big Bear, CA is <span> 6,750 feet above sea level.</span>
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