porphyroblast

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President Richard M. Nixon smiles and gives the victory sign as he boards the White House helicopter after his resignation on August 9, 1974 in Washington, D.C.

Timeline of the 1970s

Computer mapping, woman at early 1990s computer

Timeline of the 1990s

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Artist interpretation of a Space meteoroid impact. Meteor impact. Asteroid, End of the world, danger, destruction, dinosaur extinct, Judgement Day, Planet Earth, Doomsday Predictions, comet

10 Failed Doomsday Predictions

green digital binary symbols

What Comes After Terabyte?

German machine gunners occupy a trench during World War I.

Weapons of World War I

porphyroblast

crystal

Learn about this topic in these articles:

metamorphic rocks

In metamorphic rock: Major features
, garnet) are termed porphyroblasts.
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