How does sound travel?
through vibration of particles
Higher amplitude, ____________
Louder sound
Higher frequency,___________
Higher pitch
sound wave reinforcement=
constructive interference
sound wave cancellation=
destructive interference
What crashed into the Earth in The Collision Theory?
Theia, a newly formed planet
How was the Moon formed?
formed when the rocks and dust from the collision was pulled together by gravity
State 2 evidences that supports the collision theory.
- Moon less dense than Earth
- Moon surface once molten
- Moon has a small iron core like the Earth
- evidence of similar collisions
- fits theory of how the Solar System was formed
- composition of rocks are same on The Moon and The Earth
State 2 evidences that contradicts the Collision theory.
- Surface of Earth does not appear molten.
- Venus has no moon.
- Composition of rocks on Moon should be more similar to rocks on Theia than Earth
What is nebula?
clouds of dust and gas in space
What gas is a nebula mostly made of?
hydrogen
What are stellar nurseries?
areas in space where stars are formed
Do nebulae act as stellar nurseries?
Yes
Structures of Earth from hottest to coldest.
inner core, outer core, mantle, crust
What is the crust made out of?
tectonic plates
How do tectonic plates move?
convectional currents in the mantle/continental drift(heat and pressure)
4 evidences of tectonic plates
- Jigsaw appearance of continental coasts
- Location of volcanoes and earthquakes
- Fossil records
- Alignment of magnetic materials in the Earth’s crust
