Scientists<span> can tell by observing the seismic waves that are recorded all over the surface of the </span>earth<span> from distant earthquakes. The seismic waves are reflected (bounced off) </span>layers<span> of different density, and they are refracted (bent) when they enter </span>layers<span> of different density.</span>
a drop of water may spend over 3,000 years in the ocean before moving on to another part of the water cycle
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<span>As of 2016, farm and ranch families made up only two percent of the total US population. The amount of farmer and ranching families has declined at a fast pace since it's peak in 1935. In the last twenty years most of the decline can be blamed on how little farmers and ranchers make from the food they grow or raise. Farmers and ranchers only receive, on average, sixteen cents for every dollar that is spent on food in both grocery stores, down from about thirty-one cents for every dollar in the 1980's.</span>
