Final answer:
A shield volcano is a very broad volcano with gently sloping sides. It is formed by thin and runny lava flows that create a wide and flat volcano.
Step-by-step explanation:
A shield volcano is a very broad volcano with gently sloping sides. It is similar in shape to an ancient Greek shield, which is why it is called a shield volcano. These volcanoes are formed by thin and runny lava flows that spread out in all directions, creating a wide and flat volcano.
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