Ptygmatic folding: "At a small scale (outcrop-sized), contorted folds are found in metamorphic rocks such as gneisses. The rocks actually soften as they are heated during deep burial." Caption from link

Ptygmatic folding: "At a small scale (outcrop-sized), contorted folds are found in metamorphic rocks such as gneisses. The rocks actually soften as they are heated during deep burial." Caption from link

Great reference, used when teaching Geologic Time, helps students to see the changes the continents have undergone.

Great reference, used when teaching Geologic Time, helps students to see the changes the continents have undergone.

Opalized Wood                                                                                                                                                                                 Más

Las piedras preciosas, más específicamente los diamantes, son los mejores amigos de las mujeres, pero existen minerales que los superan ampliamente en bell

Timeline of the San Andreas fault, showing the subduction of the Farallon and Pacific Plates by the North American Plate over the last 30 million years.

Timeline of the San Andreas fault, showing the subduction of the Farallon and Pacific Plates by the North American Plate over the last 30 million years.

Familiarity with #tree types and #wood grain is one of the most important skills of #woodworking.

52 types of wood and the trees they come from

Familiarity with #tree types and #wood grain is one of the most important skills of #woodworking.

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