(Description) Figure 34 Detail of smooth cryovolcanic lava (A) on Ariel that has spilled out beyond the end of a trough and covered half of a of 30-km diameter crater (B). To its lower left, a slightly smaller crater (C) has been formed by an impact into the lava surface; this crater must therefore be younger.

Week 7: Exploring moons

This image shows detail of smooth cryovolcanic lava (labelled as A) on Ariel that has spilled out beyond the end of a trough and covered half of a of 30-km diameter crater (labelled as B). To its lower left, a slightly smaller crater (labelled as C) has been formed by an impact into the lava surface; this crater must therefore be younger.