Please give me the answers

1. B

2. repeated snows harden into glaciers

3. They move by winds and currents of the sea.

4. we only see about one-eighth of the entire mass of an iceberg

5. The coast guard radios a warning and gives exact location of the iceberg to all ships in the area.

6. Can cause damage to a ship causing it to sink

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

explanation:

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