Presentation on theme: "The Earth, the Moon, and the Sun"— Presentation transcript:
1 The Earth, the Moon, and the Sun Physical Science
2 The Earth in Space Section 7-1 Gravity from the Earth-Moon-Sun system directly affects the conditions for life here on Earth.
3 The Physical Characteristics of the Earth Diameter (12,714 km/7,926 mi.)Circumference (40,075 km/24,901 mi)Mass (5.98 x1024 kg/1,130,000,000,000,000,000,000,000 lbs.)Average distance from the Sun (149,000,000 km/92,384,987 mi.)Average distance from the Moon (384,400 km/238,855 mi.)
4 The Earth’s Magnetic Field The Earth’s magnetic field helps protect the Earth from harmful radiation/energy from the Sun.
5 The MagnetosphereAreas of charged particles (protons and electrons) that circle the Earth above the atmosphere. The particles are held in place by gravity and are called the “Van Allen belts”.
6 The AuroraA stream of particles called the “solar wind” flow through space from the Sun toward the Earth and collide with the magnetic field that causes them to flow down toward the north and south poles.
7 The AuroraThe “solar wind” particles then collide with atoms in the atmosphere at the poles and cause the solar wind particles to give off light.
12 The Earth’s Orbit around the Sun Elliptical shaped orbit
13 The Earth and Venus Same size Venus has an atmosphere of 96% CO2 creating an average temp of 460 Celsius (860 F)Earth has an atmosphere of 0.04% CO2 creating an average temp of 15 Celsius (60 F).
14 The Earth and Mars Earth is twice as large The Earth’s gravity is strong enough to hold our atmosphere in place, Mars cannot hold one sufficient for life as we understand itAverage temperature on Mars is -63 Celsius (-85 F)
17 Time and Seasons Section 7-2 People have used the movements of the Earth, Moon, and Sun to measure time for thousands of years.
18 Time ZonesThe Earth spins one complete turn in 24 hours, so 360 degrees of motion in 24hrs give you 15 degrees of movement an hour.360/24 = 15This motion creates 24 time zones of 15 degrees of longitude each.
19 LongitudeLines running east to west that when used with lines of latitude help us calculate position on the Earth. GPS