What causes earthquakes? - National Geographic
2024年9月12日 · Most earthquakes occur at fault zones, where tectonic plates —giant rock slabs that make up Earth's upper layer—collide or slide against each other. These impacts are usually gradual and ...
Plastic pollution facts and information - National Geographic
2024年9月23日 · Production increased exponentially, from 2.3 million tons in 1950 to 448 million tons by 2015. Production is expected to double by 2050. Every year, about eight million tons of plastic waste ...
The solar system—facts and information - National Geographic
2019年3月27日 · Known as natural satellites, they orbit planets, dwarf planets, asteroids, and other debris. Among the planets, moons are more common in the outer reaches of the solar system. Mercury and Venus ...
Volcano facts and information - National Geographic
2018年1月15日 · Volcanoes, explained. These fiery peaks have belched up molten rock, hot ash, and gas since Earth formed billions of years ago. Volcanoes are Earth's geologic architects. They've created more than ...
What is global warming, facts and information - National Geographic
2019年1月22日 · What is global warming, explained. The planet is heating up—and fast. Glaciers are melting, sea levels are rising, cloud forests are dying, and wildlife is scrambling to keep pace. It has become ...
Tsunami Facts and Information - National Geographic
Tsunamis. These destructive surges of water are caused by underwater earthquakes. A tsunami is a series of ocean waves that sends surges of water, sometimes reaching heights of over 100 feet (30.5 ...
Renewable energy, facts and information - National Geographic
2019年1月30日 · Hydropower: For centuries, people have harnessed the energy of river currents, using dams to control water flow. Hydropower is the world's biggest source of renewable energy by far, with China ...
Rainforest and Amazon facts and information - National Geographic
2019年5月15日 · Rainforest loss. Deforestation is endangering rainforests worldwide, driven by logging, mining, agriculture, and ranching. About 17 percent of the Amazonian rainforest has been destroyed over the ...
Greenhouse gases, facts and information - National Geographic
2019年5月13日 · Greenhouse gases have far-ranging environmental and health effects. They cause climate change by trapping heat, and they also contribute to respiratory disease from smog and air pollution. Extreme ...
Oceans—facts and information - National Geographic
2019年3月21日 · The oceans hold about 321 million cubic miles (1.34 billion cubic kilometers) of water, which is roughly 97 percent of Earth's water supply. Seawater's weight is about 3.5 percent dissolved salt ...