Earth and Solar Systems Review 3

Gas planets (4)

Jupiter, saturn, uranus, neptune, cold enough for gases to become liquid or ice

Oldest earth and moon rocks and meteorites age

Earth rocks: 3.9 billion years old

Moon rocks: 4.4 billion years old

Meatorites: 4.6 billion years old

Radioactive decay

Elements that decay at specific rates

Isotope

Different versions of elements

Half-life

Time it takes for one half of material to decay

Parent material

Starting element

Daughter material

Element parent decays

Earth was

a molten and then started cooling down

Layers formed with

Dense things sinking to the center, top crust is made of silica and its still recycling the crust which is volcanoes

Biggest to smallest in solar system (7)

1. Star

2. Gas giants

3. Rocky planets

4. Some moons

5. Dwarf planets

6. Asteroids

7. Comets

Dwarf planets

Planets that haven’t been cleared out and still orbits sun

Earths atmosphere formed

After earth was formed