How do we know Earth's internal structure?


Seismic waves from earthquakes that pass through Earth's interior before being recorded by seismographs are used to reconstruct Earth's internal structure. Seismic waves are refracted or reflected at major density changes or phase changes. For example, S waves cannot pass through liquids, and this tells us that Earth's outer core is molten.

Environmental & Atmospheric Sciences

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Sustainable Development Goals are designed to build upon:

A. The ten Century Goals B. The National Environmental Policy Act C. The eight Millennium Development Goals D. The Clean Water Act

Environmental & Atmospheric Sciences

When representing wind direction numerically, winds from the north are associated with:

A) 235 degrees. B) 90 degrees. C) 0 degrees. D) 180 degrees.

Environmental & Atmospheric Sciences

Draw and label a diagram of the hydrologic cycle

What will be an ideal response?

Environmental & Atmospheric Sciences

What tool is often used to measure the topography of the seafloor today?

A) High-resolution multibeam instruments B) Sonar C) Echo sounders D) Radar altimeters

Environmental & Atmospheric Sciences