📖 视听背景导读 · Background Overview
大地因何撼动？我们又该如何面对突如其来的地震灾难？
地壳并非浑然一体的坚硬整块，而是由漂浮在炽热岩浆之上的 12 个主要地质构造板块组合而成。当板块之间发生挤压、碰撞或俯冲（Subduction Zone）时，积聚的能量突然爆发，便会形成毁灭性的地震。
全球每年可探测到的地震超过 50 万次，其中约 100 次会造成严重破坏。里氏震级每上升 1 级，地面摇晃幅度扩大 10 倍。面对特大地震，现代工程师正致力于研发柔韧抗震建筑，科学家也正力争破译早期震兆，守护无数宝贵生命。
地壳并非浑然一体的坚硬整块，而是由漂浮在炽热岩浆之上的 12 个主要地质构造板块组合而成。当板块之间发生挤压、碰撞或俯冲（Subduction Zone）时，积聚的能量突然爆发，便会形成毁灭性的地震。
全球每年可探测到的地震超过 50 万次，其中约 100 次会造成严重破坏。里氏震级每上升 1 级，地面摇晃幅度扩大 10 倍。面对特大地震，现代工程师正致力于研发柔韧抗震建筑，科学家也正力争破译早期震兆，守护无数宝贵生命。
📝 2. Video Activities 原版全套练习
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📘 Before Watch: Definitions (词汇释义)
📗 Before Watch: Predicting (机制探讨)
📑 While Watch: Gist (主题勾选)
📕 While Watch: Detail (细节选择)
🗂 20 Vocab Review (词汇盘点)
🤔 Critical Thinking (综合探究)
📘 Before You Watch · A. Definitions 词汇释义 (Page 71)
4 题 · 英文精准匹配
On May 22, 1960, the largest magnitude earthquake in recorded history—9.5 on the Richter scale—hit southern Chile. This devastating quake left two million homeless. Occurring at a relatively shallow depth of 30 km, shockwaves rattled houses in cities thousands of miles away.
1 Something that is not very deep can be described as ________.
✓ 正确答案：A (shallow)
官方释义 (TG)：1. shallow 指震源深度较浅（not deep），浅源地震破坏力往往极其巨大。
2 When an earthquake is of a large ________, it’s very big.
✓ 正确答案：B (magnitude)
官方释义 (TG)：2. magnitude 指地震震级，衡量地震释放能量的指标。
3 If something is ________, its destruction is extreme.
✓ 正确答案：A (devastating)
官方释义 (TG)：3. devastating 意为破坏力极大的、灾难性的。
4 When something is ________, it is shaken considerably.
✓ 正确答案：C (rattled)
官方释义 (TG)：4. rattled 指强烈震动摇晃。
📗 Before You Watch · B. Predicting 地震成因探讨 (Page 71)
1 题 · 地质机制
5 According to geological science, how do earthquakes begin?
✓ 正确答案：B
TG 官方解析：The Earth's crust sits on top of tectonic plates, which move. As the plates push together, they slip or fall beneath one another, sending shockwaves through the rock.
📑 While You Watch · A. Gist 视频涉及主题 (Page 72)
1 题 · 核心议题匹配
6 Which of the following topics are covered in the video? Check the correct combination:
✓ 正确答案：A
TG 官方答案：Topics covered include: how earthquakes happen; how earthquakes are measured; examples of strong earthquakes. (视频并未且无法断言下一次确切喷发时间)
📕 While You Watch · B. Detail 细节选择题 (Page 72)
3 题 · 官方标准选择
7 According to the video, what is true about a subduction zone?
✓ 正确答案：B (TG 官方答案：1. b)
视频台词原文：The most violent earthquakes start in a subduction zone where one tectonic plate is pushed beneath another.
8 Which of these earthquakes was more deadly?
✓ 正确答案：B (Haiti, 2010) (TG 官方答案：2. b)
视频台词原文：The shallow quake that hit Haiti in 2010 killed over 300,000 people, making it one of the deadliest on record (compared with over 8,000 in Nepal).
9 According to the video, how many earthquakes each year actually cause damage?
✓ 正确答案：A (100) (TG 官方答案：3. a)
视频台词原文：It is estimated that there are over 500,000 detectable quakes... 100,000 can be felt, and 100 of them cause actual damage.
🗂 Vocabulary Review · Unit 4 核心词汇打勾自测 (20 Words)
全单元词汇盘点
Do you remember the meanings of these words? Check (✓) the ones you know.
Reading 4A 核心词汇
Reading 4B 核心词汇
已自测掌握：0 / 20 词
🤔 Critical Thinking · Justifying an Opinion (Page 72)
决策论证
If you were a government decision-maker in an earthquake-affected country, which would you prioritize?
• reinforcing old buildings
• ensuring new buildings are earthquake-proof (TG 推荐优先视角)
• educating the public on earthquake safety
• researching ways to predict earthquakes
• ensuring new buildings are earthquake-proof (TG 推荐优先视角)
• educating the public on earthquake safety
• researching ways to predict earthquakes
TG 教师用书参考答案：
“I would prioritize ensuring that new buildings are earthquake-proof because that seems like a realistic way to help save lives now. Engineers have already designed proven methods, so I would want to use that technology in my city.”
“I would prioritize ensuring that new buildings are earthquake-proof because that seems like a realistic way to help save lives now. Engineers have already designed proven methods, so I would want to use that technology in my city.”
🏅 UNIT 4 GRAND SLAM
Unit 4 暴烈地球 · 全单元通关大满贯
Sacred Summits + Is Prediction Possible? + Earthquakes 101
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4A 精读与复习
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4B 精读与复习
0 / 9
拓展视频得分
0 / 20
全单元词汇掌握
“All this is done in hopes that we can one day learn to predict earthquakes accurately, protecting more homes and countless lives.”