A black hole.
As a river gets older sediment load decreases due to the age of the river and erosion
because gravity is happy
In a body of water as it approaches the shore, it contains a certain amount of energy. As the sea bed shallows, the wave will be slowed, but the height will consequently increase. But the water at the peak of the wave will still be travelling at its old (faster) velocity. Thus it will travel faster than the water below it, and eventually overtop it.
There are some other things happening inside the wave which complicate the picture. One of these is that the individual molecules of water don't move very much in an ordinary wave - they just circulate in a small region. It is the energy that is travelling, not the molecules of water.
The grasses and other plants in a wetland act as a filter for the water, removing contaminants, cleaning up the water. The soil holding the plants acts like a sponge, sops up pollutants.
STRATOSPHERE
the clouds
Which mesosphere? The one for the Earth's atmosphere or for the inside? Well, I'll talk about inside. Extremely hot temperatures (since it is the middle of the Earth's inside) so about a few thousand celsius. The mesosphere in the atmosphere is very cold with temperatures as low as -90 degrees celsius.
anything to keep you warm
Evidence is not used to support theory.
Theory is used to explain evidence, and to predict where and how new evidence may be found.
When new evidence is found that theory can't explain, the prevailing theory is modified or discarded.
The shape, size, and mass of water molecules do not change between the solid and gas phases.
I have no idea