1. The Inner Rocky Planets By:Joyce Lee and Kay LimAnd Kay Lim

2. Key Terms!  AU- stands for astronomical unit, and it’s the distance between the earth and the Sun  Terrestrial planets- The inner planets that are closest to the Sun. Also another name that inner planets are called.  Moon- a natural satellite of any planet  Atmosphere- the envelope of gases surrounding any planet  Orbit- the path that is taken by an object moving around a larger object in space

3. Inner Planets  None of the inner planets have rings  Orbit the sun more quickly  Spin more slowly  Elements on the inner planets are more closely packed together, allowing them to be smaller on solid  All the inner planets are solid, but you would only be able to survive on Earth

4. Mercury  It’s the smallest inner planet, and closest to the sun  Mercury is composed of iron and nickel  Has many flat plains and crates on its’ surface, the craters show how little Mercury has changed

5. Mercury  Virtually has no atmosphere, daytime temperatures cause gas particles to move very fast, because there is no atmosphere, heat escapes into space at night  Has no moons  Has a.39 AU distance to the sun  Period of rotation around the sun is 59 days

6. Venus  Venus’s density and internal structure similar to Earth  The atmosphere is very thick, so it’s always cloudy, the clouds are mostly droplets of sulfuric acid  Pressure is so great, it is 90 times greater than Earth’s  Has no moons

7. Venus  The surface of Venus has many volcanoes, and broad plains formed by lava flows  Has an AU of.72 to the sun  Period of rotation around the sun is 243 days.  Traps heat by its atmosphere, known as the greenhouse effect.

8. Earth  Atmosphere protects the planet from dangerous radiation and helps keep valuable sunlight in… therefore, it keeps life surviving  Has a magnetic field  Has one moon  Composed of a mixture of various rocks and minerals

9. Earth  The temperature varies at different climates  Earth’s core is made of mainly iron and nickel, the outer core is liquid, but the inner core is solid  Has an AU of 1  Largest inner planet  Period of rotation around the sun is 1 day  Only inner planet that carries waterwater

10. Mars  Has two moons-named Phobos and Deimos  Last inner planet  Known as Red Planet due to the rust of iron-rich materials that form its’ surface  Has a thin atmosphere  It is believed that water once existed on the planet might have leaked into space

11. Mars  Has a network of canals and canyons  Mars’ atmosphere is 95% carbon dioxide  Has seasons just like earth  Some parts on Mars has giant volcanoes  Period of rotation around the sun is 1.03 days

12. Quiz! 1. What is does AU mean? a. Alternate universe b. Astronomical unit c. Gold in the periodic table d. None of the above 2. How many moons does Mars have? a. 2 b. 9 c. 1 d. 7 3. Which is the largest inner planet? a. Venus b. Mars c. Earth d. Mercury

13. 4. What’s the smallest inner planet? a. Mercury b. Earth c. Venus d. Mars 5. True or False? Venus’s density and internal structure similar to Earth 6. How many days does it take for the Earth to make one rotation around the Sun? a. 10 b. 1 c. 5 d. 20

14. 7. True or False? Earth is not protected by a magnetic field 8. True or False? The pressure of the atmosphere on Venus is greater than Earth’s 9. How many terrestrial planets are there? a. 1 b. 4 c. 5 d. 8 10. True or False? Earth is the only inner planet that contains water

15. Answer Key 1. B 2. A 3. C 4. A 5. True 6. B 7. False 8. True 9. B 10. True