A boat with bricks is floating on the water. When the bricks are thrown into water; the level of water in the pond :

• An object that is fully or partially submerged in a liquid experiences an upward force proportional to the weight of the moving liquid, according to the Archimedes principle, a scientific law.
• The weight of the boat, the brick, and the water push the water down and up while the brick is on the boat. 
• The brick replaces its volume in the water at the water's bottom, not its weight. 
• Brick has a higher density than water or volume, which causes the water level to decrease.
• A liquid's buoyancy is the upward force it exerts to balance out the weight of an item that is partially or entirely immersed. 
• The weight of the liquid above causes the pressure in a liquid column to rise with depth. As a result, there is more pressure at the bottom of the liquid column than at the top.

Hence the correct answer is decreases.