GEOL 1 Lecture Notes - Lecture 3: Magnesium, Hematite, Subduction
Document Summary
Rife valleys and mid ocean ridges are types of plate boundaries, they"re just specific types of divergent boundaries. Continents colliding together, neither wants to go down because both are low density so create mountains because both are going up instead of down. Pt 1: chemistry review and mineral basics. Rate of asteroid impacts with earth may have increased 2. 6 x around 290 ma. Calculated in part based on lunar crater formation. Atoms: basic building blocks of matter. (nucleus in the center) Element: substance made of only one type of atom. Non-alive, doesn"t have organic compounds like protein. How do we identify specific minerals? (properties) Some minerals have a certain color but others don"t. Ex: quartz comes in every color in the rainbow. Color of the mineral when it is ground up into a powder. Color of the streak is usually the color of the mineral. Ex of when it"s not: hematite (different color streak)