The earth's surface is constantly changing through slow processes that we don't usually see. One is erosion. This has worn away rocks and mountains over millions of years, caused by air, water, and wind. Another change is caused by earthquakes that originate deep inside the planet. More sudden and violent than erosion, an earthquake results when strains between Earth's plates produce shock waves. And, the third process results when molten rock- forming material like lava, escapes onto the surface through gaps in the crust. What we experience is volcanic eruption. 1. What is the paragraph about? 2. What are the effects enumerated in the changes of earth's surface? 3. What word or phrases signal used in the paragraph.


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