Shaping the Earth's Surface — Chapter Toolkit
One planet, two kinds of forces — everything in this chapter comes down to that.
Across this whole chapter, you've met landforms built by rivers, wind, ice, waves and groundwater — plus forces from deep inside the Earth. Before reading the close of this chapter, which single landform from everything you've read surprised you the most, and why?
Step back and this whole chapter turns out to be a single story — a tug-of-war. Two sets of forces are fighting over the shape of the Earth's surface, and every landform you've met is a snapshot of that struggle frozen at one moment. Internal forces, powered by the planet's inner heat — plate movement, earthquakes, volcanoes, the folding and faulting of rock — build the surface up, raising mountains and cracking open valleys and ocean basins. External forces — weathering, erosion and deposition, driven by sun, water, ice and wind — wear it back down, grinding those mountains away grain by grain and spreading the debris into plains and deltas. Neither side ever wins for good, which is exactly why the Earth's surface is never finished.
Internal vs External — the Two Kinds of Forces
Here's the cleanest way to hold the whole chapter in your head: two teams with opposite jobs. Internal forces build the land up — plate movement, earthquakes, volcanoes, folding and faulting. External forces wear it back down — weathering, and erosion by water, wind, ice, waves and groundwater. Tap through the two below, then look back at any landform in this chapter and ask yourself: which team shaped this — or was it both, at once?
A brand-new volcanic island rises out of the ocean overnight after an eruption. Based on everything in this chapter, what will most likely start happening to that island from the very next day onward?
What if…
What if human activity — cutting down forests, building on unstable slopes, warming the climate enough to melt glaciers faster — starts speeding up landforms that would otherwise take thousands of years to change? What do you think that would mean for how ready communities need to be for disasters like the ones in this chapter?
Understanding the shape of the Earth's surface helps you appreciate nature's power and prepare wisely for natural disasters, building a safer, more sustainable relationship with the planet. Every landform in this chapter — from a waterfall to a sand dune to a limestone cave — is really one chapter in the same ongoing story: the tug-of-war between forces building the Earth up, and forces wearing it back down.
Q1.According to this chapter's closing recap, which of these is an example of an internal force shaping the Earth's surface?
Across this whole chapter, you've met landforms built by rivers, wind, ice, waves and groundwater — plus forces from deep inside the Earth. Before reading the close of this chapter, which single landform from everything you've read surprised you the most, and why?
Step back and this whole chapter turns out to be a single story — a tug-of-war. Two sets of forces are fighting over the shape of the Earth's surface, and every landform you've met is a snapshot of that struggle frozen at one moment. Internal forces, powered by the planet's inner heat — plate movement, earthquakes, volcanoes, the folding and faulting of rock — build the surface up, raising mountains and cracking open valleys and ocean basins. External forces — weathering, erosion and deposition, driven by sun, water, ice and wind — wear it back down, grinding those mountains away grain by grain and spreading the debris into plains and deltas. Neither side ever wins for good, which is exactly why the Earth's surface is never finished.
Internal vs External — the Two Kinds of Forces
Here's the cleanest way to hold the whole chapter in your head: two teams with opposite jobs. Internal forces build the land up — plate movement, earthquakes, volcanoes, folding and faulting. External forces wear it back down — weathering, and erosion by water, wind, ice, waves and groundwater. Tap through the two below, then look back at any landform in this chapter and ask yourself: which team shaped this — or was it both, at once?
A brand-new volcanic island rises out of the ocean overnight after an eruption. Based on everything in this chapter, what will most likely start happening to that island from the very next day onward?
What if…
What if human activity — cutting down forests, building on unstable slopes, warming the climate enough to melt glaciers faster — starts speeding up landforms that would otherwise take thousands of years to change? What do you think that would mean for how ready communities need to be for disasters like the ones in this chapter?
Understanding the shape of the Earth's surface helps you appreciate nature's power and prepare wisely for natural disasters, building a safer, more sustainable relationship with the planet. Every landform in this chapter — from a waterfall to a sand dune to a limestone cave — is really one chapter in the same ongoing story: the tug-of-war between forces building the Earth up, and forces wearing it back down.
Q1.According to this chapter's closing recap, which of these is an example of an internal force shaping the Earth's surface?