A cloud.
A lifebuoy or life preserver is a floating device used to help people stay afloat in water in case of emergencies.
It is called a Mirage.There is a lot of information about the phenomenon on Wikipedia.http://en.wikipedia.org/wiki/Mirage
It is the force working upwards if it is greater in value than to the gravity force of the floating object that works downwards. if it was less then call it negative buoancy and then the floating object will tend to be unstable (subject to sink)
Water is transparent because visible light can pass through it without being absorbed or scattered. This is due to the molecular structure of water, which allows light to travel through with minimal interference, enabling us to see objects on the other side of the water.
The energy that gets trapped in Earth's atmosphere from the sun is called solar radiation. This energy is absorbed by the atmosphere and contributes to the warming of the planet through a process known as the greenhouse effect.
a cloud
In our surroundings, there will be water vapour, but it will be of small quantity. so it is invisible. In case of boiling water or freezing , there will be water vapour of large quantity, so it will be visible to our naked eye
A lifebuoy or life preserver is a floating device used to help people stay afloat in water in case of emergencies.
I think you are looking for "water vapor"
Tea weed
The Floating Call - 1914 was released on: USA: 14 November 1914
Sometimes. We call them "asteroids" when we see them floating in space. Occasionally, one of them (or a piece of one) will collide with the Earth's atmosphere, and it will burn up as a meteor.
Floating wreckage is often referred to as flotsam and jetsam.
Geographers refer to the circulation of water through the Earth's crust, oceans, and atmosphere as the "hydrological cycle" or "water cycle."
that process is called precipitation...............
Relative humidity the exact amount of water vapor in the atmosphere (specific humidity)
You would call something that is obvious or visible "apparent" or "evident."