lecture 11 earth n moon continued

What is earth crust made of

Silicates (rocks)

What is the mantle of earth made of

Denser silicates, liquid and thick

What is core made of

Liquid iron

What is earth inner core made of

Solid iron

How is the age of rocks determined

The amount of uranium/led in them, more uranium means older rock

How long did the earth take to completely form

30-50 million years

What is moon made out of

Mostly rock all the way to the center

Temperature on moon

-110 night 130 day, having no atmosphere makes it hard to smooth out temperatures

Which is older and newer- cratered highlands and Maria

Highlands are older (bright spots), Maria is newer (darker)

Hoe were Maria formed

A collision at the back of the moon melted the rock and seeped out making the Maria

How was the moon made

Large body hit earth, crust and mantle material is ejected, material gathers together by gravity

Describe mercurys appearance

Heavily cratered, dense ball of iron with a thin rocky crust

Mercury is (5 things)

Small, close to sun, fast, dense, hot n cold

Mercury has a special rotation

3, 2 resonance, it gets stretched and unstretched during a single orbit around the sun

How do the sun and mercury effect each other

The suns tidal effect acts on mercurys orbit, as mercury gets further away gravity is weakened so it moves turns slowly