sand is weak against water as the added weight makes it difficult to control. it also seems to be weak against lightning, as sasuke's chidori was seen to be able to pierce it.Actually it is known that it protects him automatically...you know his mother is protecting him O_O
Also why you no tell me the strength and weakness of sand?
*i put in the cloth around my eyes and spread my chakra all around me, into my existing sand and into the ground. i then send my existing sand into the ground as well to grind up enough sand to cover the full range. i then spread the grains of the sand out to tiny specks. after infusing the sand with a wave of chakra that constantly flows into it, i have the grains spread around the field, detecting the movement of the clone*Can you quote me please, as this makes it a little easier for me.
Moving on:
(Kanchiki Suna no Jutsu) - Sensor Sand Technique
Rank: C
Type: Supplementary
Range: Short - Mid
Chakra cost: 15
Damage points: N/A
Description: The user will release a special type of sensory sand across a terrain and then upon contact with an enemy target the sand can alert the user of the location and presence of an enemy target. The sand can even detect invisible targets and stick to their body.
Note: Can only be used by Gaara
Okay with your chakra release it all around you (up to mid range) and then either create the sand or get sand and spread it across the terrain. Now keep a constant signal with the sand as then when something applies pressure or moves the sand you will know of it.
I throw you a piece of cloth, after you put it on I create three clones. Now find where they are after you do this jutsu...