Answer:
About 3500 meters of summit of a composite volcano collapsed after an explosive eruption of about 500 cubic kilometers of pyroclastic material. Later the caldera was eventually filled with water.
Explanation:
Crater Lake is one that is found to occupy a basin in Mount Mazama in south-central Oregon in the western United States. Mount Mazama, which is about 12,000 ft (roughly 3,700m) collapsed during an intense volcanic eruption, which led to the formation of volcanic depression called caldera.
Pyroclastic flows of pumice and ash affected the nearby areas which also included the water body that drained the mount Mazama.
D. Alexander von Humboldt
Explanation:
urban areas are mostly characterised by high population advanced technology and basic amenities. The population helps to increase productivity which leads to economic development, employment opportunities that promotes increase in standard of living which in turn helps economic development.
Answer:
54
Explanation:
54 country's are there in Africa
