Atmosphere - Education | National Geographic Society
Earth’s atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. These gases are found in atmospheric layers (troposphere, stratosphere, mesosphere, thermosphere, and exosphere) defined by unique features such as temperature and pressure.
Earth's Systems - Education
2023年10月19日 · There are some extremely dramatic examples of Earth’s systems interacting, like volcanic eruptions and tsunamis, but there are also slow, nearly undetectable changes that alter ocean chemistry, the content of our atmosphere, and the microbial biodiversity in soil.
The Reason for the Seasons - Education
2024年3月8日 · Display the diagram “Seasons” for students, and point to the parts of the diagram as you explain the following: If you live in the Northern Hemisphere, you live on the part of the Earth that is north of the Equator. When the Northern Hemisphere is tilted toward the sun, you experience summer.
Circle of Life - National Geographic Education Blog
2015年9月22日 · Scientists have released a new version of the tree of life, showing everything we know about how the 2.3 million living things of Earth are related to one another. (Washington Post) Learn what criteria scientists use to classify organisms with our activity.
Equator - Education | National Geographic Society
2023年10月19日 · The Equator is an imaginary line around the middle of Earth. It is halfway between the North and South Poles, and divides Earth into the Northern and Southern Hemispheres.
Plate Tectonics - Education
2024年3月7日 · Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements. The theory, which solidified in the 1960s, transformed the earth sciences by explaining many phenomena, including mountain building events, volcanoes, and earthquakes.
Core
2024年6月11日 · Earth’s core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly solid mantle . The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a …
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Earth's Interior
Earth's interior is generally divided into three major layers: the crust, the mantle, and the core. The hard, brittle crust extends from Earth's surface to the so-called Mohorovicic discontinuity, nicknamed the Moho.
Age of Earth - Education
2023年10月19日 · What are significant events that occurred in Earth’s past that show up on the chart? What time period do you live in? How do you think scientists are able to determine the relative date of the fossils and rocks they find?
The Rock Cycle - Education
Many of Earth’s key processes function in cycles and rock cycle is no exception. The rock cycle is a web of processes that outlines how each of the three major rock types—igneous, metamorphic, and sedimentary—form and break down based on the different applications of …