Changes to Earth’s Surface

Science — Second Preparatory

Internal factors

Comparison aspect	Main idea	Keywords
Earthquakes	sudden shaking of the crust caused by rocks moving along a fault. They can crack the ground and change its shape	suddenshakingcrustcaused
Volcanoes	magma gases and ash rise from inside the Earth to the surface and new volcanic hills and mountains are formed	magmagasesriseinside
Movement of tectonic plates	the Earth’s crust is divided into plates that move slowly. When they move apart or towards each other mountains valleys and faults are formed	Earthcrustdividedslowly
•	These factors raise and lower rock layers which is why mountains form and why folds and faults appear in rocks	Thesefactorsraiselower

Changes to Earth’s Surface · 2 / 7