Final answer:
Iceland is the Nordic country that obtains 100 percent of its electricity and heat from renewable sources, primarily due to its substantial geothermal and hydroelectric resources.
Step-by-step explanation:
The Nordic country that obtains 100 percent of its electricity and heat from renewable sources is Iceland. This remarkable achievement is due largely to the country's significant geothermal resources, which are a product of its location on the geologically active Pacific Rim, sometimes referred to as the "ring of fire".
Besides geothermal energy, Iceland makes use of hydroelectric power to meet its energy needs. Despite the impressive percentage of renewable energy use for electricity in countries like New Zealand, which gets about two-thirds of its electricity demand met by hydroelectric power, Iceland stands out for its complete reliance on renewables.