If you belong to the second group, spending the night in the wilderness cabins at Hawaii's Haleakalā National ... including Halalii cinder cone's austere peaks, which look as though they're ...

Your mission: Find a few invasive silk oak trees scattered across a 35,000-acre ancient cinder cone that resembles a ... a fungal disease affecting ohia trees on Hawaii island.

Ash released from shield volcanoes often builds up around the vent forming a steep, round hill known as a cinder cone. A lava tube may also form, beneath the surface of the ground, when low ...