Craters are commonly found at the summit of volcanic edifices, but they may form above satellite (flank) vents of composite and shield volcanoes. Craters are landscape features that form during eruptions. They are formed by blasts or other explosive eruptive phenomena, including phreatic and phreatomagmatic processes.

In most volcanoes, the crater is situated at the top of a mountain formed from the erupted volcanic deposits such as lava flows and tephra. Volcanoes that terminate in such a summit crater are usually of a conical form. Other volcanic craters may be found on the flanks of volcanoes, and these are commonly referred to as flank craters.

2016年1月6日 · Even after they become dormant or extinct, volcanoes are still incredibly majestic – here we’ll take a look at just some of the most spectacular craters they left behind. Image credits: Eric...

There are four major geologic processes that affect planetary surfaces – impact cratering, volcanism, tectonics, and erosion. Impact cratering is the most pervasive surface process on all planetary bodies. In this lab, you will: . • Become familiar with the relationship between crater size and crater morphology and the properties of projectiles.

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Volcanoes can have various active craters over time and multiple eruptions can form overlapping or nested craters. Hazards include ballistic ejecta, pyroclastic flows (also called pyroclastic density currents), ashfall, lahars, lava flows, volcanic lightning, volcanic gas, and structural failure.

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Unusual and beautiful volcanic cones, traces of human activity, lush vegetation and colorful crater lakes are the main reasons why many tourists visit these extraordinary destinations. 1. Diamond Head, Hawaii, USA. Diamond Head is the name of a …