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fjord: a long, steep-sided glacial valley now filled by seawater.
emerge: to rise from an obscure position or condition; to become visible.
geothermal energy: a form of energy conversion that captures heat energy from within Earth.
hot spring: a spring whose water issues at a temperature higher than that of its surroundings.
welfare state: a state assumes primary responsibility for the social welfare of its citizens.
achieve: to carry out successfully; to accomplish.
undergo: to go through; experience.
invasive species: a non-indegenous or non-native species that threatens ecosystems, habitats or other species.
chapter 10
glaciation: a process by which glaciers form and spread.
occur: to come into existence, happen.
ecotourism : the practice and business of recreational travel based on concern for the environment