earth science question?

Cheylea

New member
Which of the following is a region with steep undersea mountains and deep valleys?

1 continental margin
2 ocean ridge
3 ocean trench

I'm pretty sure it's option 3, but i'm not positive. help? :)
Also -

Which of the following currents has great impact on reshaping the shoreline?

1 longshore current
2 flood current
3 ebb current

I also think this is option 3, but does anyone know if im right or wrong? :)
 
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