Pahoehoe crust forms on relatively high viscosity lava. Crystal settling causes low density minerals to sink to the bottom of plutons. The type of soil in an area is vital in determining the type and suitability of septic systems for homes built in that area. Glassy igneous rocks are evidence of extremely slow cooling of the magma. Pillow lava form from under water volcanic eruptions.
Sheeting is mechanical weathering due to the growth of mineral like clay.
Erosion requires rocks to move, weathering does not. Multiple Choice . Circle the letter of the word or phrase that best completes the sentence or answers the question. Worth 2 pts. A. 4.6 thousand .B. 4.6 million C. 4.6 billion D. 4.6 trillion .