Introduction to ¡°Why? The Earth¡± ¡¦ 3
Samcheongapja Dongbangsak, 180,000 Years Old ¡¦ 8
The Earth is Round ¡¦ 12
How Did the Earth Come into Existence? ¡¦ 19
How Did Land and Ocean Come into Existence? ¡¦ 22
The Appearance of the First Organism-Precambrian Era ¡¦ 26
What Kind of Organisms Lived in the Paleozoic Era? ¡¦ 30
The Mesozoic Era-the Era of Dinosaurs ¡¦ 32
The Cenozoic Era, When Human Ancestors First Appeared ¡¦ 34
The History of the Earth in the Strata ¡¦ 36
Dongbangsak¡¯s Past ¡¦ 38
Moving Continents ¡¦ 42
The Earth¡¯s Main Axis-the Mantle and the Core ¡¦ 49
Volcanic Eruptions-the Earth¡¯s Fireworks ¡¦ 52
The Features of a Volcano ¡¦ 58
Why Do Earthquakes Occur? ¡¦ 60
What to Do in an Earthquake ¡¦ 64
Mythical Continents ¡¦ 68
Orogeny, the Process of Mountain Formation ¡¦ 70
The Life of a Mountain ¡¦ 74
The Shape of Korea ¡¦ 76
What Makes Up the Crust ¡¦ 78
Meandering Rivers-Erosion ¡¦ 81
How Strata are Formed ¡¦ 83
Fossils-Treasures Buried in the Strata ¡¦ 86
Petroleum and ...Coal-Valuable Underground Resources ¡¦ 90
Sedimentary Rocks-Layers of Rocks ¡¦ 92
Igneous Rocks-Rocks Formed by Volcanoes ¡¦ 94
Metamorphic Rocks-Rocks with Changed Properties ¡¦ 96
Rocks That Change Due to Weathering ¡¦ 100
From Rocks to Soil-The Power of Organisms ¡¦ 102
Deserts-Dry Land ¡¦ 106
The Circulating World of Water ¡¦ 109
The Power of Water to Change Topography ¡¦ 111
Subterranean Water Flows, Too ¡¦ 116
Going on a Cave Exploration ¡¦ 120
Hot Springs and Geysers ¡¦ 123
Mountain Ranges Exist Even in the Ocean ¡¦ 126
Why Does Seawater Move? ¡¦ 132
What is a Trench? ¡¦ 137
The Arctic and the Antarctic ¡¦ 139
Our Incredible Earth ¡¦ 144
The Earth is Hurting ¡¦ 150
Only One Earth ¡¦ 155