<span>9. Contributes to medicine and agriculture
Explanation: The plant varieties and different animal species in a given location helped vegetation and many medicines were found to help mankind.
10. Crop rotation
Explanation: different varieties of crop were developed and rotation of crops in due seasons is essential for the growing population. Pollution, deforestation and climate change all affect the world.</span>
As the two tectonic plates shift, fissures periodically form in the crust that allow molten rock from underground to surface as lava, creating Iceland's many volcanoes.
