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How do scientists know all about the earth?
Answer 1:

There are several ways in which we scientists know about the earth.

The easiest part of the earth to learn about is the crust, because we can go right outside our door and see it!

Geologists (scientists who study rocks) get their best information from mapping rocks. Rocks are our biggest insight into earth processes. For example, by looking at volcanic rocks we can decide what the lava below the earth's surface contains.

A hydrogeologist's best data are measurements from rivers and water wells, to have a better understanding of our water resources.

A soil scientist's best way to learn about the earth is by digging holes, analyzing the soil, and mapping out where we find the best soils for growing plants.

A modern technology we use is satellite data. For example, we can use satellite data to track exactly how many centimeters the San Andreas Fault moves each year.


Answer 2:

We do not know everything about the Earth

We know what we do know by exploring the Earth, and by watching as earthquake waves move through the Earth and seeing how they behave.



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