Actually, heated materials are less dense. When heat is applied to a substance such as liquid, it becomes less dense. It is this less dense and heated material that rises because it weighs less. The part of the mantle that is more dense would be any substance that is cooling and is sinking down.
No, a heated material becomes less dense and if it is less dense than surrounding material it will rise.
Yes.
Denser and rises
There are many that would argue yes, although it is a heated debate.
the constructed environment includes the natural environment after it has been changed by human effort. A constructed environment is created when a dwelling is built, landscaped, and heated and/or cooled to control the indoor climate.
when rubber is moulded in die and kept for heat after few min the die is removed from heat... the ruber reduces its size compare to original size of die ... its called srinkage of rubber... this srinkage in rubber have different percentage of srinkage in different types of rubber....
http://www.energy.gov.on.ca/index.cfm?fuseaction=conservation.guide13 can give you some info. Also, according to USA today, natural gas users will pay over $1000 for a 5 month usage. That's a lot of people, considering that 55% of US homes are heated with Natural Gas. These prices are rising and electricity heating users will pay about $750. People who use heating oil to heat their residential properties will pay even more. On average, they will pay over $1400.
no
It was heated by convection currents
Convection currents from the stove or microwave.
It's heated through the convection currents.
currents caused by the motion of heated molecules
which diagram correctly indicates why convection currents form in water when water is heated
the currents would stop as soon as the heated substace has cold completely.
Currents that form in heated air are similar to currents that form in warm water because heated air goes up and cold air goes down creating convection currents.
currents caused by the motion of heated molecules
It falls back down
Actually, hot, less dense material rises, and cold, denser material sinks. Denser material will be heavier (per unit volume) and gravity therefore pulls it down. Less dense material has buoyancy and rises. It's very logical.
Convection currents