A-Olympus Mons, a 69,000-foot-tall mountain on Mars, is the largest volcano in the solar system. Its circumference at the base is large enough to cover almost the entire state of Colorado. A space probe could safely land at almost any point on the volcano without fear of it toppling over due to a landing on a steep slope. What type of volcano is Olympus Mons?
a. Stratovolcano
b. Cinder cone
c. Caldera
d. Shield
e. Can't tell from just the information provided
B-The rocks exposed in Boulder Canyon are almost all igneous. The texture of these igneous rocks is phaneritic. By recognizing this texture you can tell the following about the geologic history of Boulder Canyon:
a. An explosive volcanic eruption formed the rocks of Boulder Canyon, meaning that the rocks were likely formed in a caldera
b. The silica content of the Boulder Canyon rocks is high, meaning that the canyon is composed of continental crust
c. The rocks of Boulder Canyon lay far beneath the surface when they formed, meaning that a major episode of erosion occurred since then
d. The rocks of Boulder Canyon must form a dike, because if they formed a sill the texture would be aphanitic instead