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as often as needed
Cheap chimney liners can be purchased from some of the following: Discount Chimney Supply, Hartshearth, Chimney Liner Depot or Stoves Online. In many cases the cheap chimney liners may be more costly in the long run is they fail and need to be replaced because these liners should be professionally installed and that often costs more than the liner.
Wild honeybees often make their nest in a hollow tree.
where boundaries are often found at ocean ridges.
A good quality stainless steel chimney should never need to be replaced unless it has been damaged in some way. There are several manufacturers of chimney liners that offer a lifetime warranty.
called mandrel.
That's a geode.
There were no ocean dwelling dinosaurs. Large marine reptiles that are often thought of as dinosaurs include plesiosaurs, pliosaurs, mosasaurs, and icthyosaurs.
There are several bodies of water surrounding the continents, including the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Arctic Ocean, and the Southern Ocean, thought the Arctic and Southern Oceans are often considered to be part of the Pacific, Atlantic, or Indian Oceans.
a geode. They're fairly common, but often very pretty.
they often occur in places close to the ocean so they can get their energy from the ocean water.
That's a geode.