Daily Snapshots - Previous Snapshot Grows When Deleting Snapshot Before

Hi. I am new to NetApp, so please excuse the probably simple question. When I log into our SVM and run the following: 

snapshot show volNameHere

I get the list of the snapshots. This is a very inactive volume, so snapshots are very low in size (about 1MB). However when I run the following command to delete the snapshot:

snapshot delete -volume volumeNameHere -snapshot snapshotNameHere

It removes the snapshot, however it makes the snapshot before it grow to almost its same size. 

My question is how are these snapshots linked so when I delete say the one from Friday, the snapshot from Thursday takes its size? Thanks in advance!