A lake is bigger than a pond.
Plants can only grow along the shoreline because of the deep water.
Some lakes are so big that there are waves.
In summer, the temperature of the water in a lake is not the same: the top part of the water gets more of the sun's heat and is warm, the middle layer is cooler because it gets less of the sunlight , and the bottom layer, which does not get any sunlight, is quite cold.
More creatures live in the warmer water.
Even in the coldest places, most lakes are so big and deep that they don't freeze solid in winter, but a layer of ice can form across the surface.
The ice blocks out the sunlight, and oxygen levels in the water drop, killing some plants and animals. This is called 'winterkill'