1 Subjects: “...;The Earth: natural history: general interest;Earth sciences;Environmental science, engineering...”

2 Subjects: “...Earth-to-Air Heat eXchangers...”

3 Subjects: “...rare Earth metal oxides...”

4 Subjects: “...mixed rare earth...”

5 Subjects: “...mixed rare earth...”

6 “... to generate synoptic information for virtually all parts of the Earth, including the atmosphere, land...”

7 “...Geothermal energy is the thermal energy generated and stored in the Earth's core, mantle, and crust...”