Upcoming SlideShare
Loading in …5
×

# Chapter 23 (Section 1 Earth)

6,086 views

Published on

Chapter 23: Earth-Sun-Moon System
Section 1 Earth Notes

Published in: Education
0 Comments
0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• Be the first to comment

• Be the first to like this

No Downloads
Views
Total views
6,086
On SlideShare
0
From Embeds
0
Number of Embeds
2,525
Actions
Shares
0
Downloads
36
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
• Aristotle reasoned that the Earth was round because it cast a round shadow (Not flat) on the Moon during eclipsesSailors used line of sight to show the Earth was curved
• ### Chapter 23 (Section 1 Earth)

1. 1. Chapter 23The Sun-Earth-Moon System<br />Company Name<br />
2. 2. Chapter 23: Section 1: Earth<br />A. Properties of Earth—people used to think that Earth was flat and at the center of the universe.<br /> 1. Earth is now known to be a round, three-dimensional sphere.<br /> a. Axis—imaginary vertical line around which Earth spins<br /> b. Rotation—the spinning of Earth around its axis that causes day and night<br />2. Earth has a magnetic field with north and south poles.<br />3. Magnetic axis—imaginary line joining Earth’s magnetic poles<br /> a. Earth’s magnetic axis does not align with its rotational axis.<br /> b. The location of magnetic poles slowly changes over time.<br />
3. 3. Chapter 23: Section 1: Earth<br />Magnetic Axis: <br />A compass points to magnetic North (not North Pole)<br />The difference between polar North and magnetic north is 11.5 degrees. <br />Earth’s characteristics<br />Only known planet to have liquid water. <br />Made up of 70% water. <br />97% of water on Earth is salted. <br />Only known planet to have life. <br />
4. 4. Chapter 23: Section 1: Earth<br />Sailors used line of sight to show the Earth was curved<br />Aristotle reasoned that the Earth was round because it cast a round shadow (Not flat) on the Moon during eclipses<br />
5. 5. Chapter 23: Section 1: Earth<br />EARTH INFORMATION (DO NOT COPY IN YOUR NOTES)<br />Diameter: (Pole to Pole) = 7,901 mi.<br />Diameter: (at Equator) = 7,926 mi<br />Earth rotates at about 1000 mi/hr.<br />Mass: 5.98 x 1027 g = 5.98 x 1023 kg<br />Density: 5.52 g/cm3<br />Average distance from the Sun = 149,600,000 km<br />Period of Rotation (1 day) = 23hr. 56 min. <br />Pd. of Revolution (1 year) = 365 days 6 hr. 9 min.<br />Polar tilt: 23.50 from vertical<br />Average Temperature is 60oF<br />Hottest Temperature: 134oF in Death Valley California (1913)<br />Coldest Temperature: -129oF in Vostok, Antartica (1983)<br />This means the earth is constantly moving around the sun.<br />
6. 6. Chapter 23: Section 1: Earth<br />Causes of Seasons<br />Revolution: Earth’s yearly orbit around the Sun. <br />Earth’s orbit is an ellipse, or elongated, closed curve.<br />Because the Sun is not centered in the ellipse, the distance between the Earth and the Sun changes during the year. <br />Earth’s tilt causes seasons. <br />The hemisphere tilted toward the Sun receives more daylight hours than the hemisphere tilted away from the Sun. <br />The longer period of sunlight is one reason summer is warmer than winter. <br />
7. 7. Chapter 23: Section 1: Earth<br />Causes of Seasons<br />Earth’s tilt causes the Sun’s radiation to strike the hemisphere at different angles. <br />Due to Earth’s tilt on it’s axis (23.5 degrees)<br />The hemisphere tilted toward the Sun receives more total solar radiation than the hemisphere tilted away from the Sun. (more solar energy = warmer temperatures)<br />In the hemisphere tilted toward the Sun, the Sun appears high in the sky and the radiation strikes Earth more directly.<br />Seasons are opposite between hemispheres<br />
8. 8. Chapter 23: Section 1: Earth<br />Causes of Seasons<br />
9. 9. Chapter 23: Section 1: Earth<br />Causes of Seasons<br />Distance from the sun changes during the year<br />Closest to the sun = Perihelion Jan 3rd and is about 91,500,000 miles from the sun.<br />Farthest from the sun = Aphelion July 4th and is about 94,500,000 miles from the sun.<br />
10. 10. Chapter 23: Section 1: Earth<br />Solstice: (means longest)<br />The day when the Sun reaches its greatest distance north or south of the equator. <br />Summer solstice occurs June 21 or June 22 in the northern hemisphere. (Sun reaches the Tropic of Cancer)<br />This is the longest day of the year. (In terms of sunlight)<br />About 16 hours of sunlight that day<br />North pole receives 24 hours of sunlight that day!!<br />South Pole receives 24 hours of night. <br />Winter solstice occurs December 21 or 22 in the northern hemisphere. (Sun directly on the Tropic of Capricorn)<br />(This is the shortest day of the year. (In terms of sunlight)<br />About 16 hours of night<br />North pole has 24 hours of night on that date. <br />
11. 11. Chapter 23: Section 1: Earth<br /> Winter Solstice: <br />Summer Solstice: <br />
12. 12. Chapter 23: Section 1: Earth<br />Equinox<br />The day when the sun is directly over Earth’s equator. <br />Daylight and nighttime hours are equal all over the world. <br />Daylight = 12 hours, Night = 12 hours<br />Spring equinox occurs on March 20 or 21 in the northern hemisphere. (Beginning of Spring) <br />Fall equinox occurs on September 22 or 23 in the northern hemisphere. (Beginning of Fall)<br />Spring and Fall dates are reversed for the Southern Hemisphere. <br />
13. 13. Chapter 23: Section 1: Earth<br />Equinox<br />Two equinoxes occur each year. <br />Fall Equinox <br />Spring Equinox<br />