Lake Isle of Innesfree

Explain why : Rivers and lakes do not freeze easily?

What is the nature of wave produced in a lake, due to an explosion inside the lake ?

Why do marine animals live deep inside of lake when the surface of the lake freezes?

The angle of elevation of a stationary cloud from a point 25 m above a lake is 30^(@) and the angle of depression of its reflection in the lake is 60^(@) . What is the height of the cloud above that lake-level ?

The angle of elevation of a stationary cloud from a point 2500 feet above a lake is 30^@ and the angle of depression of its reflection in the lake is 45^@ .Find the height of cloud above the lake water surface .