Which of the following two statements are true for a tsunami?
(1) It involves movement of water from surface to sea-floor.
(2) Shoaling effect can greatly increase wave-heights closer to coast.
(3) In the open ocean tsunami waves reach greater heights.
(4) Speed of tsunami is controlled by wind velocity.
1
(1) and (3)
2
(2) and (4)
3
(1) and (2)
4
(3) and (4)