Geologists at Hawaiian Volcanoes Obseratory, (HVO), collect samples of lava from active flows to get information on temperature, gas content, and chemical composition of the lava. In this photo, a geologist braves extreme radiant heat to collect a sample from an 'a'a flow. The photo on the bottom is a thermal image that shows the temperature gradient of the lava. The interior of the flow exceeds 1000 degrees celsius, (1800 degrees fahrenheit).
Photo: Hawaiian Volcanoes Observatory