To classify a volcano, the following three features would be relevant:
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Steepness: This is important as it helps distinguish between different types of volcanoes, such as shield volcanoes (which are broader and have gentle slopes) and stratovolcanoes (which are steeper and more conical).
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Type of Lava: The composition of the lava (such as basaltic, andesitic, or rhyolitic) plays a crucial role in determining the volcano's characteristics and eruption style.
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Age of Rock: Understanding the age of the volcanic rocks can provide insights into the volcano's activity history and classify it as active, dormant, or extinct.
The features "color" and "presence of foliage" are not primary criteria for classifying volcanoes in geological contexts.