To your question yes it is split into ranks ^^
Superb, not for your last two Lava Jutsu... S-ranks!
(Yoton: Yurasu no Kazangan) - Lava Release: Rock to Lava
Rank: S
Type: Supplementary
Range: Short-Long
Chakra Cost: 40
Damage Points: 80
Description: A jutsu that helps bring out more substance for magma jutsu, can also add a certain twist to the battlefield by changing a rocky terrain to a fiery terrain of lava. The user will focus his chakra into any earthen substance in his range and heat it up, transforming it into Lava. Its best used on the battle field ground, where large areas and fields of Lava can be created. The lava is incredibly hot and fluid and as such very damaging to the touch. However, it will eventually cool down and harden into rock with time.
Note: Usable once every 4 turns; lasts 3 turns
This has changed quite a bit since I was taught lava... For starters, note the usage restriction - Once every four turns and lasts 3 turns for each use. You're simply channeling your lava chakra into the desired area of effect, flooding it with said lava chakra, before melting the terrain into molten-fluid-like lava. After three turns, this lava will cool and harden into solid rock.
(Yoton: Maguma Hitoare no Jutsu) - Lava Release: Magma Shower
Rank: S
Type: Offensive
Range: Short-Mid
Chakra Cost: 40
Damage Points: 80
Description: The user does 2 handseals (Ram+Tiger) and kicks the ground. As a result a large geyser shoots a single compressed sphere of lava from the ground towards the sky, in between the user and the target. As the sphere reaches roughly 50 meters in the air, it explodes, producing a massive shower of small hot lava drops. The rain of lava is incredibly damaging to the touch and lethal if unguarded though it can also catch the user in its range.
You initiate this jutsu with the Ram and Tiger seals, before kicking the ground to transfer your lava chakra into it. This causes a sphere of lava to shoot from a large geyser in the ground (formed as part of this jutsu) towards the sky, half-way between you and your target. This sphere will then explode and cause a torrent of lava drops to rain down on the field, lethal to anyone caught undefended in the rain. You also need to find a way to avoid the jutsu, using a pre-made shelter of using a jutsu to counter your this one, essentially taking two chakra slots in order for you to attack an not kill yourself >__<
How would you defend against this?