Astronomy

80KM or 50 miles is what the height the government uses to get the space shuttles into space

A black hole.

1. marshes
2. swamps

As a river gets older sediment load decreases due to the age of the river and erosion

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.

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.

Mesosphere

The shape, size, and mass of water molecules do not change between the solid and gas phases.

All spacecraft returning to Earth, space shuttle or otherwise, experience extreme heating as they go through the upper levels of atmosphere. The shuttle orbiters used ceramic tiles and other heat protection. Capsules such as Soyuz, Dragon and Orion use heat shields which direct heat away from the vehicle.

I have no idea