Where does it stands what they are made of?
So far, fourteen advanced natures have been shown:
■ The Ice (氷, Kōri) nature, used by Haku and the Yuki clan, is created by simultaneously combining the
Water and Wind natures. This nature allows for the use of Ice Release (氷遁, Hyōton) ninjutsu. Used through a kekkei genkai. ■ Yukigakure-nin were able to use a different kind of Ice Release, by drawing on already-existing ice, snow, and cold. This was not a kekkei genkai, as Kakashi could copy one of these techniques with his Sharingan. This is likely a mistake, as the kekkei genkai of the Yuki clan had not been referred to as "Ice Release" yet at that time, and also the details of Nature Transformation hadn't been revealed yet, allowing the creators of Naruto the Movie: Ninja Clash in the Land of Snow to "invent" this "new" nature. Also, while Haku's Ice techniques had unusual effects, this type of Ice Release focuses on more obvious effects of ice, such as freezing.
■ The Wood (木, Ki) nature, used by Hashirama Senju, Yamato, Danzō Shimura, Madara Uchiha and Zetsu, is created by simultaneously combining the
Earth and Water natures. This nature allows for the use of Wood Release (木遁, Mokuton) ninjutsu. Used through a kekkei genkai.
■ The Lava (溶岩, Yōgan) nature, used by the Four-Tails and its jinchūriki Rōshi, as well as Mei Terumī, Kurotsuchi and Dodai, is created by simultaneously combining the
Fire and Earth natures. This nature allows for the use of Lava Release (熔遁; 溶遁, Yōton). The Four-Tails and Rōshi used it through a Tailed Beast Skill, while Mei, Kurotsuchi and Dodai used it through a kekkei genkai. ■ It is implied that the two ways of writing this nature (熔遁; 溶遁) are pointing out that they are different in some way. They are switched around and alternated throughout the plot, with Iwagakure and Kumogakure characters using the kanji "熔" and the Kirigakure character using the kanji "溶". However, the true purpose of this difference is unknown.
■ The Crystal (結晶, Kesshō) nature, used by Guren, is possibly created by simultaneously combining the
Earth nature and another unspecified nature. This nature allows for the use of Crystal Release (晶遁, Shōton) ninjutsu.(Anime-only)
■ The Blaze (炎, Honō) nature, used by Sasuke Uchiha, originates from the flames of Amaterasu and allows the use of Blaze Release (炎遁, Enton) ninjutsu.
It is unknown what this nature entails.
■ The Storm (嵐, Arashi) nature, used by Darui, and stolen by Hiruko, is created by simultaneously combining the
Lightning and Water natures. This nature allows for the use of Storm Release (嵐遁, Ranton) ninjutsu. Used through a kekkei genkai. ■ It is likely that the two users were using a different type of this release, as Hiruko is a character only seen in Naruto Shippūden 3: Inheritors of the Will of Fire, and Darui hadn't been introduced at that time. There is also a significant difference between the techniques of this nature they use.
■ The Boil (沸騰, Futtō) nature, used by Mei Terumī, is created by simultaneously combining the
Water and Fire natures. This nature allows for the use of Boil Release (沸遁, Futton) ninjutsu. Used through a kekkei genkai.
■ The Dust (塵, Chiri) nature, used by Ōnoki and Mū, created by simultaneously combining the
Fire, Earth and Wind natures. This nature allows for the use of Dust Release (塵遁, Jinton) ninjutsu. Used through a kekkei tōta.
■ The Dark (冥暗, Meian) nature, stolen by Hiruko, allows the use of Dark Release (冥遁, Meiton) ninjutsu.
It is unknown what this nature entails. Used through a kekkei genkai. (Movie-only)
■ The Steel (鋼, Hagane) nature, stolen by Hiruko, allows the use of Steel Release (鋼遁, Kōton) ninjutsu.
It is unknown what this nature entails. Used through a kekkei genkai. (Movie-only)
■ The Swift (迅速, Jinsoku) nature, stolen by Hiruko, allows the use of Swift Release (迅遁, Jinton) ninjutsu.
It is unknown what this nature entails. Used through a kekkei genkai. (Movie-only)
■ The Explosion (爆発, Bakuhatsu) nature, used by Gari and Deidara, allows for the use of Explosion Release (爆遁, Bakuton) ninjutsu.
It is unknown what this nature entails. Used through a kekkei genkai.
■ The Scorching Heat (灼熱, Shakunetsu) nature, used by Pakura, allows for the use of Scorch Release (灼遁, Shakuton) ninjutsu.
It is unknown what this nature entails. Used through a kekkei genkai.
■ The Magnetism (磁力, Jiryoku) nature, used by Toroi, the Third and Fourth Kazekage, allows for the use of Magnet Release (磁遁, Jiton) ninjutsu.
It is unknown what this nature entails. Used through a kekkei genkai.
The Bolded is your proof.