Science Weekly is a subscription magazine for children in K-6th grade.
Levels B and C
Levels D and E
You can tell from the front covers, that each level gets
progressively more detailed.
In the next two pictures below, you can see the different activities
in the magazine.
The first one is level E, the one I used with my daughter.
The second one is level Pre-A, the one I used with my son.
Here is a side by side view of the back covers of level Pre-A and level E.