Non-renewable Resources
分类: 自然奥妙
non-renewable image from http://keydifferences.com/wp-content/uploads/2017/01/renewable-vs-non-renewable-resources.jpg
gas and coal fire image from https://www.sciencelearn.org.nz/resources/1570-non-renewable-energy-sources
metals image from http://dorecycling.com/how-much-natural-resources-we-have-left/
minerals image from https://www.kullabs.com/classes/subjects/units/lessons/notes/note-detail/484