HARRY HESS and SEAFLOOR SPREADING NOTES Name ______________________ Class _______

Question Answer

Harry Hess1. Who is Harry Hess? 2. What was his job?

The Discovery1. What did Harry Hess

discover? 2. How did he discover

it?

Sea-floor Spreading1. What is it?2. Where does it hap-

pen? 3. How does it happen?4. What does it do?

Evidence for His Discovery

Molten Material1. How was it found?2. What did it show?

Magnetic Strips1. What is this? 2. How did it happen?3. What does it show?

Drilling Samples1. What are these?2. Where are they

from?3. How did they get

them?4. What did they show?

Subduction and Sea-floor Spreading

Subduction1. What is it?2. Where does it hap-

pen?3. What happens?4. How is it related to

sea-floor spreading?