1.  The Inner Planets Chapter 20 Section 3

2.  The Inner Planets are the 4 planets closest to the Sun  Mercury, Venus, Earth, and Mars  The Inner Planets are also known as terrestrial planets  Terrestrial planets have rocky surfaces The Inner Planets

3.  Mercury is the closest planet to the Sun  Mercury is slightly larger than the Moon Mercury

4.  Mercury is a planet of extremes  Temperatures on Mercury can get as cold as -170 o C (-274 o F) and get as hot as 430 o C (806 o F)  Mercury has these extreme temperatures because it has a very thin atmosphere  *Remember* A planet’s atmosphere is what helps regulate the planet’s temperature (think about the Earth) A Planet of Extremes

5.  Venus aka the “morning star” aka the “evening star”, is the 2 nd planet from the Sun  Venus is not a star though, because it does not create its own light.  It shines because it reflects light from the Sun  Venus is the only planet that rotates East to West.  It’s “moving backwards”! Venus

6. VVenus is slowww… IIt takes about 7.5 months for Venus to revolve around the Sun BBut it takes about 8 MONTHS for Venus to make 1 rotation. 11 Day for Venus is longer than 1 Year!!

7.  Venus’ atmosphere is made of mostly carbon dioxide  *Remember that CO 2 is a greenhouse gas  Venus is becoming hotter and hotter because it has mostly green house gas in its atmosphere  Global warming is always happening on Venus Venus’ Greenhouse

8. EEarth is the 3 rd planet from the Sun EEarth’s atmosphere is made up of 20% oxygen. TThis is very important for living organisms like…humans TThe rest of the atmosphere is mostly made of nitrogen and water vapor CClouds are made of water vapor 770% of the Earth is covered with water!! Earth

9. EEarth’s atmosphere is made up of 20% oxygen. TThis is very important for living organisms like…humans TThe rest of the atmosphere is mostly made of nitrogen and water vapor CClouds are made of water vapor 770% of the Earth is covered with water!!

10. Layers of the Earth

11.  The Earth is broken up into 3 main layers  The CRUST is the outside rocky layer  The MANTLE is the next layer, which is made of molten rock  The CORE is divided into a liquid OUTER CORE and a solid INNER CORE Earth

12.  Mars is the 4 th planet from the Sun  Mars is also known as the “Red Planet” because of its reddish surface  Mars’ atmosphere is mostly carbon dioxide Mars – The Red Planet

13.  Mars is the 4 th planet from the Sun  Mars is also known as the “Red Planet” because of its reddish surface  Mars’ atmosphere is mostly carbon dioxide Mars – The Red Planet

14.  Astronomers have found remains of water on Mars  The north pole of Mars contains ice!  Mars’ south pole is made of frozen carbon dioxide (aka Dry Ice)  Mars has seasons just like we do on Earth Mars – The Red Planet