Is my team good for a sand team?

Question

tyranitar @ Assault Vest
Ability: Sand Stream
EV: 252 HP/ 252 Atk / 4 Sp.D
Adamant Nature
-Pursuit
-Avalanche
-Earthquake
-Stone Edge

Hippowdon @Leftovers
Ability: Sand Stream
EV: 252 HP/ 2 Atk / 252 Def
Impish Nature
-Slack Off
-Stealth Rock
-Roar
-Ice Fang

Excadrill @ Choice Scarf
Ability: Sand Rush
EV: 4 HP/ 252 Atk / 252 Spe
Adamant Nature
-Rapid Spin
-Iron Head
-Rock Slide
-Earthquake

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EV: 252 HP/ 4 Atk / 252 Def
Impish Nature
-Leech Seed
-Spikes
-Thunder Wave
-Power Whip

Mamoswine @Leftovers
Ability: Thick Fat
EV: 252 HP / 252 Atk / 4 Sp.D
Adamant Nature
-Ice Shard
-SuperPower
-Ice Fang/ Earthquake (Can't decide which one)
-Stone Edge

Clefable @Leftovers
Ability: Magic Guard
EV: 252 HP / 4 Sp.A / 252 Sp.D
Calm Nature
-Moonblast
-Protect
-Flamethrower
-Wish

Any advices are highly apreciated, Also this is my first post here, so i don't know if i posted it in te right place thanks

Comments

for mamoswine i would go for ice fang instead of ice shard, and it is a yes to earthquake, you should have more ways to deal with fighting and water types.  try using a psychic like metagross who will take none from sandstorm and has the ability to curb fighting types, but good job with the ferrothorn.

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Most of this is great! However give mamoswine earthquake and i recommend you give tyranitar a focus sash instead of an assault vest. The reason for that is because when a tyranitar is in sandstream its sp.def already increases significantly. Focus sash are for those fighting type moves. Makes them survivable.

Hope I helped!