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Splash Screen. Intro 1. Our Solar System. Section 1-6. The sun is at the center of our solar system. . At least nine planets orbit our sun. What are they?. (pages 33–35). Click the mouse button or press the Space Bar to display the information. Mercury, Venus, Earth, and Mars.
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Our Solar System Section 1-6 The sun is at the center of our solar system. • At least nine planets orbit our sun. • What are they? (pages 33–35) Click the mouse button or press the Space Bar to display the information.
Mercury, Venus, Earth, and Mars Section 1-7 • Farther from the sun are the gas giant planets– • Jupiter, Saturn, Uranus, and Neptune. • Pluto, the exception among the planets, is a ball of ice and rock. (pages 33–35) Click the mouse button or press the Space Bar to display the information.
Getting to Know Earth Section 1-10 • The surface is about 30 % land • and about 70 % water. • The atmosphere is about • 78 % nitrogen, • 21 % oxygen, • and 1 % other gases, such as argon. (pages 35–36) Click the mouse button or press the Space Bar to display the information.
Earth’s Heights and Depths • The highest point on Earth is the summit of Mount Everest at 29,035 feet (8,852 m) above sea level. Section 1-14 • Earth’s lowest point of dry land is on the shore of the Dead Sea at 1,349 feet (411 m) below sea level. (page 36) Click the mouse button or press the Space Bar to display the information.
The deepest known level of the ocean floor is the Mariana Trench at 35,827 feet (10,923 m) below sea level.
Earth’s Structure Section 2-6 • A Layered Planet The earth is composed of three layers: the core, the mantle, and the crust. • The inner core is about 4,000 miles (about 6,430 km) below the surface. • The outer core is about 1,400 miles (about 2,250 km) thick. (pages 37–39) Click the mouse button or press the Space Bar to display the information.
Both are made of iron and nickel. The mantle is made of hot, dense rock. It releases 80 percent of the heat generated from the earth’s interior.
Many scientists believe that all the continents once were joined and have broken apart and drifted. This theory is called continental drift. Section 2-8 • Plates move gradually. As they move, they come together and pull apart. • This movement pushes up mountains, creates volcanoes, and produces earthquakes. • These activities are called plate tectonics. (pages 37–39) Click the mouse button or press the Space Bar to display the information.
Internal Forces of Change Section 2-12 • Sudden, violent movements along the fault lines are called earthquakes. • The Ring of Fire is a zone of earthquake and volcanic activity surrounding the Pacific Ocean. • Cities in this area, like San Francisco and Los Angeles, are prone to severe earthquakes. (pages 39–41) Click the mouse button or press the Space Bar to display the information.
Section 2-13 • Volcanoes are mountains formed by magma that has broken through the earth’s crust. • Volcanoes often rise along plate boundaries. • They also occur when especially hot places deep inside the earth blast their magma to the surface. (pages 39–41) Click the mouse button or press the Space Bar to display the information.
Forces of Change Section 2-2 • fold • fault • weathering • erosion • loess • glacier • moraine Define these terms: • continental drift • magma • plate tectonics • subduction • accretion • spreading
Daily Focus Skills Transparency 1 Click the mouse button or press the Space Bar to display the answer.
Daily Focus Skills Transparency 2 Click the mouse button or press the Space Bar to display the answer.
Daily Focus Skills Transparency 3 Click the mouse button or press the Space Bar to display the answer.
