Pantheon largest unreinforced concrete dome design

The Pantheon still has the largest unreinforced concrete dome

Lighter material near the dome’s top, hidden chambers in the rotunda, and an open hole at the peak all reduce its structural load.

Nahua communities kept some local control under Spanish rule

In Indigenous Nahua communities, Spanish rulers often relied on local nobles and city-states. The communities kept considerable control over local affairs, while the arrangement also let the Spanish collect taxes and exploit Indigenous labor.

Water from a sinking plate helps make magma

Where one part of Earth’s crust sinks beneath another, it carries water deep underground. That water makes the hot rock above it easier to melt. The magma that forms can then feed volcanoes at the surface.

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Pantheon largest unreinforced concrete dome design

The Pantheon still has the largest unreinforced concrete dome

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