Earthquakes and Volcanic Activities
Q: What scale is commonly used to measure earthquake magnitude?
Did You Know?
PRESENT PERFECT tense is used for past actions when the exact time is not important or not mentioned. The focus is on the experience or result, not when it happened. Example: 'She has read that book' (we don't know when, but she has the experience). If we specify the time ('yesterday'), we must use simple past ('She read that book yesterday').
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