
When Lena taps a rock with Dr Ade's old hammer, a window of light opens and shows the moment the rock was made. Now a farmer's field in Mexico is cracking and warm, and Kai is sure he knows which mountain to watch.
Planet Builders
Planet Builders is a series of illustrated adventures for readers aged ten to twelve about rocks, volcanoes, weather and water. When Lena taps a rock with an old field hammer, she and Kai can watch, through a window of light, the moment that rock was made; no adult can see it. Each book delivers one Earth-science topic through a real present-day danger, and shows how scientists prove the same story without magic.

When Lena taps a rock with Dr Ade's old hammer, a window of light opens and shows the moment the rock was made. Now a farmer's field in Mexico is cracking and warm, and Kai is sure he knows which mountain to watch.