Eternal Water is not quite as much needed as the other elemental materials, although Blizzard has tried to even out the need for these in Wrath. As always, they can be created using 10 Crystallized Water. (Some might call it “Ice”)
Eternal Life is required for many crafted items for healers, especially later on in WotLK. Just like the other elemental ingredients in Wrath of the Lich King, it is created by combining 10 Crystallized Life.
After Eternal Fire, Eternal Air is the second most used elemental crafting ingredient in Wrath of the Lich King. You can create it by combining 10 Crystallized Air, which drop from the various spots listed in this post.
Eternal Fire is one of the most sought-after crafting materials in Wrath of the Lich King. It can be acquired by combining 10 Crystallized Fire, which drops in amounts of 1-2 from Fire Elementals around Northrend.
Tiger Lily is used for some very common Elixirs like Elixir of Mighty Strength and Spellpower Elixir. In addition to this, the hydrophilic herb is also required to make the Mighty Alchemists Stone, which is very useful for Alchemists, especially early on.
The only zone in which Adder’s Tongue can be found is Sholazar Basin. The herb grows everywhere in Sholazar Basin, and it’s not limited to specific areas like trees, water, rocks or open areas. Adder’s Tongue is one of the more expensive herbs in Wrath Classic.
Lichbloom is by far the most sought-after herb in all of Wrath of the Lich King. It is used in so many high-end reciped that are needed for raiding that it’s price will likely skyrocket early on. Lichbloom needs a Skill of 425 to pick.
Saronite Ore mostly spawns in the higher level areas of Wrath Classic. Just like Cobalt Ore, it can also spawn as a Regular Saronite Deposit or as a Rich Saronite Deposit.
Icethorn is one of the high-end herbs of Wrath Classic, and it only spawns in the Storm Peaks, Icecrown and Wintergrasp. Most of the time, Lichbloom and Icethron share spawn points, and one of the two can spawn in the same location.
Cobalt Ore Deposits are most common in the Borean Tundra and Dragonblight. There are also some Deposits in other, higher level zones. In those zones, Saronite Ore takes most of the spawns, though.