Mary, whose awareness of the male sex had undergone a sea of change in the last year, left her nose in the air but let the corners of her mouth indent in a tiny smile. Eric saw it and it was enough. Moira Lindbeck saw it, too, and was struck dumb with terror.

Teenage hormones were bad enough, Ms. Doogan thought, as she led the class around a corner, hopping from dry spot to dry spot on the trail as they went. Teenage hormones and spring was a lethal combination. Add in a parent who had just been made aware of her child’s burgeoning sexuality and Ms. Doogan thought she felt the earth tremble a little beneath her feet, in either anticipation or apprehension, she could never decide. On the whole, she thought she might skip the planned lesson on the Romantic poets. They could do with rather less talk of young men and spring at Niniltna Public School at this time of year.

The trees opened up and the snow berms melted away and a small lake filled with icebergs dissolved into weird and wonderful shapes spread out before them. Between the bergs the lake was like a mirror, reflecting the bank and the trees and the bergs and the Quilak Mountains and the sky above. She dropped a curtsy. “My class, meet Grant Glacier. Grant Glacier, allow me to introduce the seventh and eighth grade classes of Niniltna Public School.”

This time the whole class rolled its eyes. She’d made them walk all the way up here, that was bad enough, but curtsying to glaciers? What next? Ms. Doogan was always doing weird stuff like that.