Science, please! help!

1. How does sea-floor spreading occur?
a.New materials are being added to the atmosphere.
b. Earthquakes break apart the ocean floor.
c. Sediments accumulate at the area of spreading.
d. Molten material beneath Earth's crust rises to the surface.


2. Which feature form the longest mountain range on Earth?
a. the mid-ocean ridges
b. the deep-ocean trenches
c. the Rockies
d. the Andes


3. How does subduction change the ocean floor?
I think it is Subduction causes the ocean floor to sink into deep-ocean trenches.
(Was too lazy to write others.)


4. Ocean trenches are formed when
a. Oceanic plate cools and moves to the surface of the ocean.
b. The denser oceanic plate sinks.
c. Molten rock cools and solidifies.
d. Magma accumulates on the ocean floor.


I knew the answer to 3, so I wrote it. Please Ms. Sue, don't just give me a link...

Thank you for any help I will get in advance...

asked by Vanessa P.
  1. 1.D
    the rest idk

    posted by Anthony
  2. I don't know what the longest mountain chain is. Why don't you google it?

    You can also check your text or google for the answer to # 4.

    posted by Ms. Sue
  3. The longest mountain chain question is tricky. Google's first links do not answer the question. However, I could post a link that does answer the question correctly.

    posted by Ms. Sue

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