Lessons+29+-+30

=Lesson 29 - __The Garden Behind the Moon__= toc David, when he saw the fountain, shouted and leaped and ran down the stony hill to where the little pool lay like a fragment of heaven amid the black, lichen-covered rocks. He plunged his face and hands and arms into the pool, and drank deep draughts of its crystal coolness. It seemed to fill his veins with fresh strength and his soul with a renewed life. Again and again he drank, and then he paused, breathing deep and full.

As he so paused, hanging over the mirror-like surface of the little pool, watching it as its rippled bosom stilled again into its first glassy smoothness, he suddenly saw reflected in the surface of the water a something that seemed to be a great bird hovering with wings outspread, high in the air above him. He looked up, and there against the blue ski overhead, far far away, he say, not a bird, but a wonderful winged hose, circling around and around on widespread wings in slow, eagle-like flight against the profound upper depths of fathomless sky.

It was the Winged Horse, and David knew that it must now be coming to drink at the fountain, for already the sun was growing red, and falling toward the west in the last hours of day. He caught up the bridle and flung it over his arm, and then drew back and hid himself among the dark lichen-covered rocks.

The Black Horse circled nearer and nearer, and though its body was black, its wings glistened as white as snow, it circled nearer and nearer, sweeping around and around in narrowing flight, until at last it hovered darkly over the spring of water. Then with its wings reaching high and quivering, it settled slowly, slowly to the earth, until it rested as lightly as a feather upon the solid rock beneath its feet. Still it held its wings poised for a moment or two, then folded them rustling across its back. Then it bent its stately head, and began to drink great draughts of water from the fountain.

Then, quick as a flash, David leaped out and upon it, and before the horse could spring sway, he had clutched it by the forelock. Then began a mighty struggle between the horse and the man. It was well for David that he himself had fist drunk strength from that fountain, for otherwise he never could have kept his hold, and would have been dashed to pieces under those iron hoofs. For the same horse struck at him with its hoofs, and beat at him with glistening pinions. But it could not shake him loose, and he still kept his hold, clinging fast to it.

dash draught fathomless fragment glisten hover outspread poised profound renewed
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=Lesson 30 - "Geology"=

Geology is the scientific study of Earth. Geologists study the planet—its formation, its internal structure, its materials, its chemical and physical processes, and its history. Mountains, valleys, plains, sea floors, minerals, rocks, fossils, and the processes that create and destroy each of these are all the domain of the geologist. Geology is divided into two broad categories of study: physical geology and historical geology.

Physical geology is concerned with the processes occurring on or below the surface of Earth and the materials on which they operate. These processes include volcanic eruptions, landslides, earthquakes, and floods. Materials include rocks, air, seawater, soils, and sediment. Physical geology further divides into more specific branches, each of which deals with its own part of Earth’s materials, landforms, and processes. Mineralogy and petrology investigate the composition and origin of minerals and rocks. Volcanologists study lava, rocks, and gases on live, dormant, and extinct volcanoes. Seismologists use instruments to monitor and predict earthquakes and volcanic eruptions.

Historical geology is concerned with the chronology of events, both physical and biological, that have taken place in Earth’s history. Paleontologists study fossils (remains of ancient life) for evidence of the evolution of life on Earth. Fossils not only relate evolution, but also speak of the environment in which the organism lived. Corals in rocks at the top of the Grand Canyon in Arizona, for example, show a shallow sea flooded the area around 290 million years ago. In addition, by determining the ages and types of rocks around the world, geologists piece together continental and oceanic history over the past few billion years. Plate tectonics (the study of the movement of the sections of Earth’s crust) adds to Earth’s story with details of the changing configuration of the continents and oceans. category chronology domain evolution extinct monitor predict process section specific
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=Unit Test Lessons 29 - 30=