Chapter 6

Question 1

How does sound travel?

Answer 1

through vibration of particles

Question 2

Higher amplitude, ____________

Answer 2

Louder sound

Question 3

Higher frequency,___________

Answer 3

Higher pitch

Question 4

sound wave reinforcement=

Answer 4

constructive interference

Question 5

sound wave cancellation=

Answer 5

destructive interference

Question 6

What crashed into the Earth in The Collision Theory?

Answer 6

Theia, a newly formed planet

Question 7

How was the Moon formed?

Answer 7

formed when the rocks and dust from the collision was pulled together by gravity

Question 8

State 2 evidences that supports the collision theory.

Answer 8

1. Moon less dense than Earth
2. Moon surface once molten
3. Moon has a small iron core like the Earth
4. evidence of similar collisions
5. fits theory of how the Solar System was formed
6. composition of rocks are same on The Moon and The Earth

Question 9

State 2 evidences that contradicts the Collision theory.

Answer 9

1. Surface of Earth does not appear molten.
2. Venus has no moon.
3. Composition of rocks on Moon should be more similar to rocks on Theia than Earth

Question 10

What is nebula?

Answer 10

clouds of dust and gas in space

Question 11

What gas is a nebula mostly made of?

Answer 11

hydrogen

Question 12

What are stellar nurseries?

Answer 12

areas in space where stars are formed

Question 13

Do nebulae act as stellar nurseries?

Answer 13

Yes

Question 14

Structures of Earth from hottest to coldest.

Answer 14

inner core, outer core, mantle, crust

Question 15

What is the crust made out of?

Answer 15

tectonic plates

Question 16

How do tectonic plates move?

Answer 16

convectional currents in the mantle/continental drift(heat and pressure)

Question 17

4 evidences of tectonic plates

Answer 17

1. Jigsaw appearance of continental coasts
2. Location of volcanoes and earthquakes
3. Fossil records
4. Alignment of magnetic materials in the Earth’s crust