While it might not be the first thing that comes to mind when you think of mountain ranges, the Mid-Ocean Ridge is a vast system of underwater mountains that circles the globe like a seam on a baseball. It's actually over 40,000 miles (64,000 km) long, making it significantly larger than any mountain range on land.

Here's why it's important to remember this:

* It's mostly underwater: The Mid-Ocean Ridge is mostly submerged beneath the ocean, which is why it's often overlooked.

* It's a source of new ocean floor: The Mid-Ocean Ridge is where tectonic plates diverge and magma rises from the Earth's mantle, forming new ocean crust.

* It's home to diverse ecosystems: Even though it's underwater, the Mid-Ocean Ridge supports a unique and diverse ecosystem, with creatures adapted to the harsh conditions of the deep ocean.

So, while the Himalayas might be the highest mountain range, the Mid-Ocean Ridge is truly the largest mountain range on Earth.