Volcanoes. Earth’s Structure Where Volcanoes Occur Volcanoes occur most frequently at plate boundaries. Some volcanoes, like those that form the Hawaiian.
Hardness Mohs Hardness Scale 1. Talc 2. Gypsum 2.5finger nail 3.5penny 3. Calcite 4. Fluorite 5. Apatite 5.0 nail 5.0-6.0 glass and knife blade.
Jeopardy! Volcanoes
Volcanoes. Where? Volcanoes occur most frequently at plate boundaries. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior.
