Which of the following statements is/are correct ?

1. Oceanic trenches are very significant in the study of plate movements

2. Oceanic trenches are associated with active volcanoes and strong earthquakes

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Which of the following statements with reference to shadow zones in an event of an earthquake is/are correct ?

1. Zone between 105° and 145° from epicentre was identified as the shadow zone for both P-waves and S-waves

2. The shadow zone of P-waves is much larger than that of the S-waves

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Which one among the following volcanic island chains is NOT associated with mid-oceanic ridge ? 

Consider the following statements with reference to sea waves :

1. The height of waves is determined by wind speed, wind duration, and fetch

2. The energy of a wave is proportional to the square of its height

3. Waves retain most of their energy as they travel across the deep ocean.

Which of the statements given above is/are correct ?