irrigation causes water levels to decrease & as the amount of water in a body of water decreases , the water levels will decrease ->  irrigation causes the amount of water in a body of water to decrease  irrigation causes the amount of water in a body of water to decrease & a lake is a kind of body of water ->  irrigation can cause the amount of water in a lake to decrease  the volume of a substance describes the amount of that substance & matter is a kind of substance ->  the volume of matter describes the amount of that matter  the volume of matter describes the amount of that matter & volume is a property of matter ->  volume is a property of matter that describes the amount of that matter  a body of water contains water & a lake is a kind of body of water ->  a lake contains water  a lake contains water & water is a kind of matter ->  water in a lake is a kind of matter  volume is a property of matter that describes the amount of that matter & water in a lake is a kind of matter ->  the volume of a lake describes the amount of water in that lake  irrigation can cause the amount of water in a lake to decrease & the volume of a lake describes the amount of water in that lake -> irrigation can cause the volume of a lake to decrease