Sentences with phrase «magnetized rock»

While the modern moon lacks a global magnetic field, magnetized rocks offer a record of what the lunar magnetic field was like when they cooled down billions of years ago.

Eventually two competing explanations emerged: Either some outside force helped stir the lunar interior and drove the dynamo, or the magnetized rocks were created by short - lived fields produced during violent asteroid impacts on the lunar surface (SN: 12/17/11, p. 17).

Not exact matches

Another group, led by MIT's Benjamin Weiss, collected rocks from the same area of the Jack Hills but says the zircon, although old, may not have been magnetized billions of years ago.

Weiss» team found that the rock conglomerate the zircon crystals were in had been magnetized just 1 billion years ago, when it probably formed as part of a volcanic eruption nearby.

The team determined the rock was 1 billion to 2.5 billion years old and found it was magnetized.

Though absent today, this ancient field is recorded in rocks retrieved from the moon's surface and in magnetized patches of crust spied by orbiting spacecraft.

When astronauts returned from the moon, they brought back a collection of puzzling, slightly magnetized lunar rocks.

By analyzing volcanic rocks and once - magnetized particles of sediment above and below fossils from the Chorora Formation, the researchers have new evidence that Chororapithecus was probably about 8 million years old.

Treadway had kept the traplines of his father and he was magnetized to the rocks, whereas Jacinta had come from St. John's when she was eighteen to teach in the little school in Croydon Harbour, because she thought, before she met Treadway, that it would be an adventure, and that it would enable her to teach in a St. John's school once she had three or four years of experience behind her.

As rocks capable of being magnetized are cooled or otherwise lithified, their component crystals (grains) are lined up with the Earth's magnetic field.