Liberal Dictionary English Dictionary
noun
- the lowest region of the ionosphere, characterized by mounting electron and ion density: exists, during the day only, from about 43 to 50 miles (70 to 80 km) altitude.
- See D region.
Topic 21: Determining the Structure of the Post-Perovskite Phase
Middle layer of earth (Mantle) – Geology
Seismic Waves Surface Waves Seismic Waves are shock waves given off
