There are two anagrams available: "CARVEN" and "CRAVEN".
4
A Cavern of Black Ice has 736 pages.
The Legend of Red Horse Cavern has 80 pages.
Southern cavern has 50 floors
There are 50 floors in Southern Cavern. On the 50BF Metal Coat can be found.
Souterrain Souterrain
I'll explore this cavern when I have a flashlight.
about 1,000 years
That depends on which cavern you mean!
Words that can be made from the letters in MAKE are:aammame
There are many caves in the Peak District, such as Peak Cavern (aka unofficially as The Devil's Arsehole), Blue John Cavern, Poole's Cavern, Speedwell Cavern. All are well worth visiting. Speedwell and Peak Caverns are in fact linked, but in a remote region beyond the show-cave limits.
Space Cavern was created in 1980.