<u>The Earth moves around the Sun</u> <em><u>while it, in turn, is also moving. </u></em>
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<em><u>A natural satellite is a celestial body orbiting a planet</u></em>. <u>The Moon is the only natural satellite on Earth, which revolves around it</u>.
<em><u>The answer is</u></em>: <u>The sun and the moon, in that order</u>.
Deserts are a natural barrier between regions, they are difficult to travel through safely due to harsh conditions. Transport of goods and people is more costly and more difficult.
The oceans of the world exist as distinctly different bodies of water
(present day) Jews and Christians (crusades) Christians