The "newest" named ocean is the Ocean.
Southern
Northern
2.
Ocean water contains about ___% salt.
3
5
7
3.
Mountains and volcanoes that are underwater are called .
seamounts
trenches
4.
When you are at the beach, you are playing in the sand of the .
sea floor
continental shelf

southern, 3, seamounts, continental shelf

Explanation:

tell me if it is right

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i