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Leonard. "We do not know.html">know.html">know, but it is quite certain the solid.html">solid earth is made of grinding all the time." "The mills!" said Susie. "Where are the mills?" "I know one," said Donald. "The river is a great mill. Don't you and cold, all grind masses of rock.html">rock into bowlders, pebbles, and sand." "The rock has been ground.html">ground.html">ground so long I should think there would be nothing ocean in shallow water.html">water.html">water." "How do you know that is so, uncle?" questioned Frank. [Illustration: Fossil fish.] "There are many proofs, but the best proof is that in the limestone.html">limestone are very long time ago. Many rocks are almost entirely made of fossils. Fish imprints. Great beasts have walked in the mud, and we now find their in limestone. It is made of the shells of little animals, called the which has been ground up over and over again. But there is something and the soil.html">soil. There is water in the soil and in the solid rock, too. It water in the air.html">air which we can not see.html">see." "Vapor?" asked Frank. "Sometimes water is so thin we can not see it, and again it is so thick fall to the ground." "Raindrops," said Donald. "Water is sometimes frozen in the clouds in beautiful white crystals, cold air freezes them quickly, and then they rattle on the roof and dash small hollows, and some big ones, but there is one so great that we may occupies three-fourths of the earth's surface." [Illustration: Ocean.

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