Name: 実生活での逆さ山 (Upside Down Mountains in Real Life)
Uploaded: 2021-01-14T10:19:44.000Z
Duration: 2 min 34 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Mountains tend to be narrower at the top than they are at the bottom – otherwise they’ll

様態の副詞

eventually fall down – but that doesn’t mean that mountains are always SMALLER at

転換語

the top. Because, what matters to most land creatures is the amount of land; that is,

the surface area, not the volume –  unless you’re a mining company that plans to pulverize

the entire mountain into smithereens. Then volume matters.

But to the rest of us, we care about surface area – and surprisingly, the area of land

on a mountain doesn’t necessarily get smaller as you go higher up the mountain – especially

when that mountain is part of a mountain range, as mountains tend to be.

Simple, lone mountains with shapes like cones or spikes or inverted parabolas do indeed

have less surface area the higher up you go, though a parabolic mountain has a lot more

area high up than a spikey mountain. And broader, flatter, mountains can actually have MORE

area the higher you go up, at least until you get to the very top. These mountains do

get skinnier as they go up, but they get flatter so much faster than they get skinnier that

from the perspective of available surface area they’re bigger on top than at the bottom!

And when you put mountains together into RANGES, it’s even more complicated. Some ranges

have LESS land area the higher you go up, some have MORE area, some have more and then

less, and some actually have more area at both the bottom and top and less area in the

In fact, if you do a survey of mountain ranges the world over, you’ll find that only around

a third of them have a constantly decreasing amount of land the higher you go, and the

rest exhibit one of the other weird “top-heavy” options.

In other words, despite appearances and as odd as it sounds, MOST mountain ranges are

bigger near their tops. Which has interesting implications for any land-dwelling creatures

that might want to move their homes and businesses up or down mountains, if, I don’t know,

And one more weird fact: a perfectly hemispherical mountain, while impossible in reality, has

just the right shape to get skinnier at the same rate that it gets flatter, so it has,

amazingly, the exact same amount of area at every elevation. The same math also means

that if you evenly slice an orange, each piece will have roughly the same amount of skin