Presentation on theme: "2.1 The Solar System Big Idea: The position of Earth in the solar system, rotation, and revolution affects weather and Human activities."— Presentation transcript:
2.1 The Solar System Big Idea: The position of Earth in the solar system, rotation, and revolution affects weather and Human activities.
Section 1 Discussion Questions What is the Earth’s position in the solar system? How do rotation and revolution affect the Earth?
Section 1 The Solar System I.Space and earth = universe I.Stars=galaxies= The Milky Way (us) A. Planets 1. Solar System - sun & group of bodies that revolve around it (planets, dwarf planets, small solar system bodies like asteroids and comets.) 2. 8 planets- Pluto considered dwarf planet in 2006 (International Astronomical Union) has a small rocky core. 3. Earth and other planets are shaped like a oblate spheroid -flattened at poles and bulging at equator 4. Moons are natural satellites that orbit planets
B. The Sun, Earth and Moon 1. Diameter of Earth is 8,000 miles * 3 rd from sun and 5 th largest * Has an elliptical (oval Shaped Orbit ) 2. Diameter of Sun is 865,000 miles (Bigger than Earth) 3. Moon orbits Earth every 29.5 days and is ¼ the size of earth. 4. All exert gravitational forces on each other which affect physical processes on Earth like tides.
Tides geography Asteriod photo is the WWII bombing of Japan and comparable to an asteriod
Earth’s Rotation, Revolution and Tilt II.A. Solar Energy-energy from sun in form of heat and light. It impacts life in many ways. B. Rotation 1. Earth spins on axis- allows equal heat and cooling 2. One complete spin is called rotation (24 hours) 3. Rotates from west to east - sun rises in the east and sets in the west
C. Revolution- Earths elliptical orbit 1. Earth makes one trip around the sun in 365 ¼ days in an ellipse. 2. Feb. 29 th is added every 4 years to make that year 366 (leap year)
D. Tilt 1. Tilted at 23 ½ degrees as it orbits 2. The tilt affects the amount of solar energy hitting the earth Reading Check: How do rotation, revolution and tilt affect the amount of solar energy received at different locations on the Earth?