Monday August 20, 2018
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In the Video: Possibilities of Ocean Floor Mapping

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The reason being that around 70 percent of Earth is covered by water, most of which are very deep up to 200 meters.
Many ways wee introduced in the past to map ocean floors and the newest one is from Japan. Pixabay
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By Ajay Kumar

  • From time to time Oceanographers have confirmed that we humans know so much about the Moon and Mars but we lack information of about 70 percent of our own planet, Earth.
  • The reason being that around 70 percent of Earth is covered by water, most of which go deep up to 200 meters.
  • There have been many ideas which were proposed to map the ocean floors. the latest comes from Japan. What is it- watch in the video:

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Oldest Known Rocks Evolved on Earth Are Result of Asteroids, Research Reveals

Meaning these rocks were rare survivors from a very different time on Earth

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Earth's oldest known evolved rocks result of asteroids. Pixabay

The oldest evolved rocks on Earth are the consequence of asteroids colliding with the the planet 4 billion years ago, an Australian research released on Tuesday revealed.

The study by the Curtin University suggests that the rocks, part of the Acasta Gneiss Complex in northwest Canada, are the result of asteroids smashing into the Earth and melting its crust, allowing evolved, or granitic, rocks to form, reports Xinhua news agency.

What led scientists to suggest that they were formed in this way was firstly, the composition of the rocks is different from the those typical of the Earth’s ancient crust.

“The only known evolved rocks from the Hadean eon are those in northwest Canada, which have chemical compositions clearly distinct from those that dominate ancient continental crust worldwide, suggesting they were formed in a different way,” research co-author professor Phil Bland said.

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Meaning these rocks were rare survivors from a very different time on Earth. Pixabay

Secondly, the rocks were melted at very low pressures, equivalent to the uppermost few kilometres of crust, meaning the event happened closer to the Earth’s surface.

“The melting of these rocks at such shallow levels is most easily explained by meteorite impacts, which would have supplied the energy to attain the extreme temperatures required for melting,” lead researcher Tim Johnson said.

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This period, around 4 billion years ago, was dominated by a barrage of asteroid impacts that would have caused widespread melting and recycling of the Earth’s surface.

“Consequently, there are almost no rocks preserved from Earth’s formative Hadean eon,” Bland said.

Meaning these rocks were rare survivors from a very different time on Earth. (IANS)

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