List of All Articles with Tag 'h'

US students give their schools an overall B- grade on average, according to a new report released Wednesday that asked fifth through twelfth graders to assess their school's quality of teaching, effectiveness in preparing them for the future and mental health support.

President Vladimir Putin acknowledged Russian troops fighting in Ukraine lack sufficient advanced weapons, as Kyiv’s forces reported some

Global oil demand growth will taper off over the next few years as high prices and Russia’s invasion

Malaysia has said it will ask Interpol to help locate Jocelyn Chia, accusing her of offensive content.

LONDON British police were questioning a man on suspicion of murder Wednesday as they sought the motive for

By Stephen Nellis SAN FRANCISCO Amazon Web Services, the world's largest cloud computing provider, is considering using new

Many of us look to the stars for answers to life’s most complex questions. But actually, some of the greatest mysteries lie beneath our very feet. One might think we’d know the Earth pretty well by now but, in fact, our planet’s core remains shrouded in enigma. Indeed, there are two gigantic blobs located beneath Africa and the Pacific Ocean that occupy around six per cent of the world’s entire volume. And yet, we’re still not entirely sure what they’re made of or where they came from. There are a number of hypotheses, including that they are piles of oceanic crust that have accumulated over billions of years. Sign up for our free Indy100 weekly newsletter But a more interesting theory is that they are huge chunks of an ancient planet that hit the Earth around 4.5 billion years ago. To give an indication of just how massive these things are, the structure under Africa – an area known as Tuzo – is thought to be around 800km (497 miles) tall – the equivalent of some 90 Mount Everests stacked on top of one another, as IFLScience notes. The problem with determining the origin of these monster formations is that there are no direct ways of observing the Earth’s core. The deepest hole humans have ever dug – branded the "entrance to hell" – reached a pretty staggering 12,263m (40,230ft), but that doesn’t even come close to breaking through the crust to the layers beneath. Our most effective tool for analysing what lies beneath the ground is a technique called seismic tomography, which looks at how waves of energy travel when earthquakes occur. Since rocks and liquids have different densities, the waves move through them at different speeds. By measuring the tremors from different points on the surface, geologists can determine what kind of material the waves are travelling through and, in so doing, map out the Earth’s interior. It was by using this technique that the two unusual structures – known as large low shear velocity provinces (LLSVPs) – were found. Waves travel more slowly in these areas – fondly known as “blobs” – than through the surrounding lower mantle, indicating that they’re made of something different. We can’t tell what this material is based on seismic tomography data alone, but some scientists like to believe that they are the remnants of an ancient planet called Theia – an idea known as the “giant impact hypothesis”. According to this hypothesis, around 4.5 billion years ago, a Mars-sized object collided with the Earth. This impact not only created the planet we call home today, but also threw off enough rock to form the moon that lights up our night skies. Some scientists suggest that some of Theia’s leftovers also sunk to the bottom of the planet, probably settling somewhere above the core – thereby forming at least one of the two LLSVPs. More Updates About Strange Blob Structures Inside Planet Earth youtu.be Experts have been investigating the area for decades but there’s still no way of knowing for sure just what these two giant blobs are. Still, studies into Theia have offered important insights into how the possible collision might have kickstarted key plate tectonic and mantle motion inside our planet – crucial processes for establishing the world on which we live. It’s also a useful reminder that we still have so much to learn about our planet and where we came from. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

By Tom Sims FRANKFURT (Reuters) -Greenpeace activists scaled Deutsche Bank's headquarters in Frankfurt on Wednesday and strung up a large

US Secretary of State Antony Blinken spoke with China's foreign minister by phone on Wednesday, a call that comes ahead of a highly anticipated expected visit by Washington's top diplomat to China as the two superpowers try to improve the dismal state of their ties.

Houston police are investigating the death of a four-year-old K-9 who suffered heat exhaustion after being left in a patrol car as temperatures rose into the 90s on Monday, police said.

TOKYO An 18-year-old Japanese soldier was arrested on Wednesday after two people were killed and one injured in

A young woman walking along a road in Upstate New York was struck and killed by a suspected drunken driver -- a coworker whom she had been drinking with earlier in the night and refused to ride with, authorities say.