Question

When you see that the ocean water is receding (disappearing) away from the beach, you MUST​

Answer 1

Answer:

If you see the ocean receding unusually rapidly or far it's a good sign that a big wave is on its way. Go to high ground immediately. Many people were killed by the Indian Ocean tsunami because they went down to the beach to view the retreating ocean exposing the seafloor.

Hope it helps

Answer 2

When you see that the ocean water is receding away from the beach  good sign that a big wave is on its way

Explanation:

It's a good warning that a big wave is approaching if you notice the water receding unusually quickly or far. Get to a high vantage point as soon as possible. The Indian Ocean tsunami killed several individuals who ventured down to the beach to see the retreating ocean exposing the seafloor.

The water level has dropped:

• Recede is a verb that implies to pull back, retreat, or fade away. Floodwaters, glaciers, and even abstractions like "panic" and "hope" are all receding.
• Consider the phrase "receding hairline."