The Delta is formed at the western edge of the Central Valley by the confluence of the Sacramento and San Joaquin rivers. It was created since the last day of the Ice Age. The role of the Delta in the two major water systems is to deliver water for irrigation in the San Joaquin Valley and municipal water supply for southern California.
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B. Ptolemy
C. Copernicus
D. Newton
2. Aristotle concluded that Earth was round because ____.
A. it always casts a curved shadow during a lunar eclipse
B. he sailed around the world
C. he calculated Earth’s circumference
D. it exhibited retrograde motion
3. The first early astronomer to propose a sun-centered solar system was ____.
A. Galileo
B. Newton
C. Copernicus
D. Brahe
The answers are:
A. Ptolemy
B. it always casts a curved shadow during a lunar eclipse
C. Copernicus
Ptolemy believed that the Earth was the center of the universe. He refined the model of Plato. He proposed that the planet has a small orbit called an epicycle and it moves along the a larger orbit that goes around the Earth.
Aristotle was convinced that the Earth was round because a lunar eclipse is caused by the shadow of the Earth. The shadow is always circular.
Copernicus was the first to propose the heliocentric model. He described the movements of the planets using astronomical theories which proposed the sun was at the center and not the Earth.
Must have at least 2 answers