Hearth
fireplace mantle
sea knoll
Lots of water will evaporate very fast and the mantle's compositions would harden and solidify to become part of a new sea floor. This is what scientists call 'sea-floor spreading'.
You have a hot water line leak under your floor -- you have to remove the floor and repair pipe or run it over head. Call your insurence company to see if they will help with cost
Yes, travertine tile can be used on the floor of a gas fireplace.
it's call an ingle In modern English, the British generally call a fireplace a 'fireplace'.
A fireplace. The same thing you call it. At least, that is what I have gathered from watching British television shows.
Hearth
The area beneath and around a fireplace is the hearth.
It's called a hearth.
place a hearth stone and use a fireplace screen
To reduce the chance of fire from materials rolling out of the fireplace, the floor in front of the fireplace should be a non-combustible material, such as brick, stone, concrete, slate, etc.
A fireplace has something called a flu. So the answer is because it has the flu! :)
There should be a louvered intake outside the fireplace, and a steel door covering the intake tunnel, inside the house located towards the front, and in the floor of the fireplace.
IF you have a woodburning fireplace, and there is a small door- about 6 inches square on the outside of the house, check for a flip open door on the floor of your fireplace. If that is what you have, this is not a vent, but an ash clean-out. Shovel ashes thru the door on the floor of the fireplace, and you can remove them from the outside door without making a mess in the house. But not a vent. If that is not what you have, please post gain with a more detailed description.
In the UK we call it the ground floor.