A/an __________ __________ Is a Deep Trough in the Crest

Q4: A chain of volcanic islands that form

Q5: Some of the world's richest offshore petroleum

Q6: Beyond the Mid-Oceanic Ridge system are flat,

Q8: Samples can be taken from the deep

Q10: The part of oceanic crust made up

Q12: The Mid-Oceanic Ridge system is the Earth's

Q13: The depth of the central parts of

Q28: Oceanic crust is mostly composed of _.

Q71: At seafloor vents, bacteria produce energy from

Q81: The west coast of South America is