Final answer:
In the given context, "surges" means that the lava rushes forward. This geothermal phenomenon can be observed safely on designated trails at Hawaii Volcanoes National Park.
Step-by-step explanation:
In the context of viewing lava flowing out of a volcano at Hawaii Volcanoes National Park, the word "surges" refers to the way lava rushes forward towards the ocean. This means that the correct answer to the question 'In this context, the word surges means: a. increases b. steps carefully c. tosses about d. rushes forward' is 'd. rushes forward'. Visitors to the park must navigate carefully on trails around the active volcanoes, where they can observe the geothermal energy in action as lava seeps from the craters of volcanoes like Pu'u 'O'o.