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Ty Wala TalgaThe ability to see Earth from space has forever changed our view of the planet. We are now able to look at the Earth as a whole, and observe how its atmosphere, oceans, landmasses, and life interact as global systems. Earth's atmosphere, hydrosphere, geosphere, and biosphere are dynamic, changing on timescales of days, minutes, or even seconds. Monitoring the Earth in near real time allows us to get an up-to-date picture of conditions on our planet.
Earth Today presents near real time data of the Earth's atmosphere, hydrosphere, geosphere and biosphere.Figure 12.3: The Earth from space. The Earth looks very different today than it did when it first formed over 4 billion years ago.
We often enjoy using our imagination to think about what the Earth was like when dinosaurs roamed around (Figure 12.4). What images come to your mind when you think about the dinosaurs? Now imagine a time on Earth before even the dinosaurs. Imagine the time before any living thing was on Earth. What images come to mind now? How do you think the Earth looked when it was first formed? This lesson will help you understand how the Earth formed, what it looked like during its earliest years, and how life first developed on Earth.