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Chapter 27.3 The Inner Planets Std. 1a- Students know how the sun, the terrestrial planets, and the gas planets may have been established during the formation.

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Presentation on theme: "Chapter 27.3 The Inner Planets Std. 1a- Students know how the sun, the terrestrial planets, and the gas planets may have been established during the formation."— Presentation transcript:

1 Chapter 27.3 The Inner Planets Std. 1a- Students know how the sun, the terrestrial planets, and the gas planets may have been established during the formation of the solar system Std. 4d- Students know the differing greenhouse conditions on Earth, Mars and Venus Objective 1: Identify the characteristics of the inner planets Objective 2: Summarize the features that allow Earth to sustain life

2 The Inner Planets Planets closest to the sun are: 1.Mercury 3. Earth 2.Venus4. Mars All similar to Earth Metallic cores and consist mostly of rock # of moons vary from 0-2

3 1) Mercury Planet closest to the sun (no moons) Orbits (day) the sun every 88 days Rotates (year) every 59 days Heavily cratered Slow rotation and no atmosphere causes a large temperature range (Day: 427°C and Night: -173°C)

4 2) Venus 2 nd planet from the sun (no moons) Orbits the sun every 225 days Rotates every 243 days Same size, mass and density as Earth

5 Venus’s Atmosphere 96% carbon dioxide causing a greenhouse effect that heats the surface to 464 degrees C Hottest planet in the solar system Sulfur dioxide droplets in the upper atmosphere creates clouds which reflect sunlight – It is the brightest object in the night sky (aside from the moon and sun)

6 Venus’s Surface Factors Has mountains, volcanoes, lava plains and sand dunes Lots of volcanic activity

7 Objective 1: Identify the characteristics of the inner planets How many moons do the inner planets have? – 0-2 moons Which planet has the same mass and density as Earth? – Venus What % of Venus’ s atmosphere is carbon dioxide? – 96%

8 Earth 3 rd planet from the sun (1 moon) Rotation 365 ¼ days Weathering and erosion continues to change Earth’s surface

9 Water on Earth – Atmosphere and distance from the sun allows water to exist in solid, liquid and gas states Life on Earth – Earth maintained a moderate temperature during formation = it can support life

10 Mars 4 th planet from the sun Orbital period 687 days Rotates every 24 hours 2 moons – Deimos and Phobos Same tilt as Earth – has similar seasons to Earth

11 Martian Volcanoes – Olympus Mons - Largest volcano is 3 times as tall as Mt. Everest The base is the size of Nebraska – Reasons for large volcanoes - no moving tectonic plates Active volcanoes = unknown Seismic activity has been detected

12 Water on Mars – Pressure and temperature on Mars are too low for water to exist in liquid form – Features caused by erosion indicate that water did exist in the past – Water on Mars is trapped by polar icecaps MarsEarth

13 Objective 2: Summarize the features that allow Earth to sustain life Why can Earth support life? – Earth maintained a moderate temperature during formation What is Mars’s largest volcano? – Olympus Mons Why does Mars have large volcanoes? – No moving tectonic plates Why can’t water on Mars exist in liquid form? – Pressure and temperature is too low


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