Chapter 24.2 Earth’s Moon.

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Presentation transcript:

Chapter 24.2 Earth’s Moon

Learning Targets Explain how scientists think Moon formed Describe the features of the Moon

Is the Moon the only place humans have visited? Is Neil Armstrongs’s footprint still there? Why? No weathering!

Ideas on how the Moon was formed?

Formation of the Moon Giant Impact Hypothesis 4.5 billion years ago Formed by impact of small planet with Earth 4.5 billion years ago Planets collide  debris orbits Earth  eventually comes together to form Moon Slowly moving away from Earth Planet sized object from space collided with the Earth and sent trillions of tons of magma and rock into Earth’s orbit. Eventually, gravity pulled all of this material together to form the Moon. How old is Earth? 4.5 billion years old

Earth’s Satellite Earth’s only natural satellite Studied directly 1969-1972 Larger than any other moon of the inner planets Last time we landed on the moon 1972

Satellite Any body that orbits a larger body Mix of falling and moving forward results in round orbits

Lunar Characteristics Moon’s Orbit Rotates once every 27.3 days Revolves around Earth every 27.3 days No atmosphere No weather  no weathering Daily temperatures range from -243° to 225° F The same side of the Moon always faces Earth. This means from Earth we always see the same side of the Moon. Atmosphere moderates temperature. Since Moon has no temperature, greater variability in temperature.

Interior of the moon Divided into layers like Earth: crust, mantle, core No tectonic activity because the interior has cooled too much Last volcanic activity ~ 1.2 billion yrs. Ago No convection cells of molten rock  no plate tectonics Because the Moon is not as dense as the Earth, gravity on the Moon is only one-sixth as strong as it is on Earth. Material studied from the Moon’s surface is close in composition to the materials on Earth’s surface.

Like the Earth, the Moon has a distinct crust, mantle, and core Like the Earth, the Moon has a distinct crust, mantle, and core. The crust is composed of igneous rock rich in the elements oxygen, silicon, magnesium, and aluminum.