The Western Hemisphere is everything that, on your globe, appears on the left of the Greenwich Meridian. That means it's the western part of western Europe, plus both Americas, and of course an awful lot of island nations and territories in both the Atlantic and Pacific oceans. The topography of these two-and-a-half continents includes high mountains, deep valleys, and the biggest crater on the planet (currently filled with ocean).
The Western Hemisphere includes 8% of Earth's total surface area, but 28.4% of its land area. However thanks to its large oceans, it is far less populated than its eastern counterpart, with only 18% of humanity living there. Still, that 18% has to contend with some of the greatest variety in climates and topography anywhere on Earth, with the north-south axis of the landmasses requiring a more adaptable culture that had to change its farming techniques to cope with every time it sought a new place to live.
From the Panama Canal to the Rockies to the Amazon rainforest to some of the driest farmland on the planet, the Western Hemisphere is full of challenges and opportunities. What this means is that the history of the hemisphere has been shaped by, well, its literal shape - and that in turn means that knowing the geography is key to understanding it. Let's see how you fare in a Western Hemisphere geographic challenge!