How the Himalayas Formed
The Himalayas, which stretch some 2,900 kilometres between India, Pakistan, China, and Nepal,
is the world’s tallest mountain range.
In addition to Mount Everest, the world’s tallest mountain by peak elevation standing
at 8,848 meters tall, the range also features several other mountain peaks over 8,000 meters.
It is the only mountain range to boast mountains over 8,000 meters—the runner-up is a mountain
range in South America, whose tallest peak is just 6,962 meters tall.
Millions of years ago, these mountain peaks didn’t exist.
The Asian continent was mostly intact, but India was an island floating off the coast
of Australia.
Around 220 million years ago, around the time that Pangea was breaking apart, India started
to move northwards.
It travelled some 6,000 kilometres before it finally collided with Asia around 40 to
50 million years ago.
Then, part of the Indian landmass began to go beneath the Asian one, moving the Asian
landmass up, which resulted in the rise of the Himalayas.
It’s thought that India’s coastline was denser and more firmly attached to the seabed,
which is why Asia’s softer soil was pushed up rather than the other way around.
The mountain range grew very rapidly in comparison to most mountain ranges, and it’s actually
still growing today.
Mount Everest and its fellows actually grow by approximately a net of about a centimetre
or so every year.
That’s in comparison to the Appalachian Mountains, which developed some 300 million
years ago or more, which are actually decreasing in peak elevations as they erode.
The continued growth in the Himalayas is likely due to the Indian tectonic plate still moving
slowly but surely northward.
We know the plate is still moving in part because of the frequent earthquakes in the
region.
Now, if you do the math, you’d find that if the Himalayas had been growing at the current
rate for 40 million years, they should be about 400 km tall!
If that was true, once the infrastructure was in place, this would have given us a much
cheaper way to put things into low Earth orbit and beyond.
(For reference, the International Space Station typically orbits at between 300 km to 400
km.)
So what happened?
In part, the rate of vertical growth has varied over time, including in favor of more horizontal
growth.
And, of course, gravity and erosion have limited the mountains’ growth significantly.
If you’re wondering who first figured out how the Himalayas formed, India merging into
Asia became the accepted theory for this formation around 1912.
That’s when Alfred Wegener, a German meteorologist, came up with the “Theory of Continental
Drift” which gave us our first ideas about Pangea, tectonic plates, and the thought that
continents were moving away from or closer to each other.
What does the future for the Himalayas look like?
Undoubtedly, the mountains will continue to grow, though at the same time eroding too;
but the net is expected to continue to grow as the Indian tectonic plate doesn’t look
like it’s going to slow down any time soon.
That means more earthquakes and, over time, slightly taller mountains to climb.
Bonus Facts: • In the last century, the east coast of
the United States has moved about 8 ft or 2.4 meters further away from Europe.
• The fossils of sea and coastal creatures can still be found in the Himalayas, as it
was once two coast lines that merged together.
These fossils not only provide evidence that the Himalayas once existed on a coastline,
but also information about climate change and plate movement.
• The name for the Himalayas comes from the Sanskrit for snow and dwelling: “him”
and “ālaya” respectively.
Essentially, the home of the snow.
• Mount Everest is named after one of the Surveyor Generals of India, George Everest.
It was not, however, Everest who first survey the mountain, but Andrew Waugh who took over
the role of Surveyor General after Everest.
Waugh thought it would be a good idea to name the mountain after his predecessor.
Everest didn’t like the idea, but he was overruled and his name was eventually adopted
for the mountain by the Royal Geographical Society in 1865.
• While Everest is generally considered the tallest mountain on Earth because it reaches
the highest elevation, some argue that this should not be the measure used, but rather
the tallest from the base to peak.
In that case, Hawaii’s Mauna Kea would be the tallest at about 10,200 metres from its
base on the ocean floor to peak at 4,205 metres above sea level.
• Sir Edmund Hillary and Tenzing Norgay, his Sherpa guide, became the first people
to successfully climb to the peak of Mount Everest in 1953.
Before Hillary, several dozen attempts had been undertaken to climb to the peak since
1921.
Since Hillary, nearly 3000 people have accomplished the same feat and around 200 have died trying.
• The Himalayas serve as a “climatic divide” as well as a physical barrier between India
and the rest of the continent.
They prevent cold winter winds from entering into India in the winter, making India warmer
than other regions along the same lines of latitude at that same time of the year.
Similarly, they prevent the southern monsoon winds from taking moisture across the border
to Tibet; the result is India gets far more precipitation than the relatively more arid
Tibet.