What is till?

Till is like the leftover bits from when something big got squished into a smaller space, and it stayed there for a really long time.

Imagine you have a cookie jar full of your favorite chocolate chip cookies. One day, someone shakes the jar really hard, so hard that all the cookies get crushed together. Now, instead of seeing whole cookies, you see a messy mix of broken pieces stuck together. That’s kind of like till, it's what happens when rocks and dirt get squeezed together by moving ice, like a giant freezer with a lot of power.

Think of an ice cream truck that moves really slowly through the neighborhood. The ice cream inside gets jostled around as the truck goes over bumps. Over time, the ice cream gets squished into the sides and bottom of the truck, it changes shape but stays there.

That’s like how till forms under glaciers. As the ice moves, it pushes rocks and dirt along with it. When the glacier stops moving or melts away, all that squished-up material is left behind, and that's till!