The external forces that modify the Earth's relief are erosion, transport, and deposition by various agents including temperature, wind, rainfall, rivers, the sea, glaciers, groundwater, and living things. These external forces erode, transport, and deposit materials over time to shape the Earth's surface features through processes like erosion, sedimentation, and relief modification. Key erosive agents that shape specific landforms mentioned include glaciers in Alaska, rivers in Las Médulas, and the sea in the White Cliffs of Dover.

1. External Forces
5. What are the external forces?
The external forces are the external agents that
modify the relief of the Earth through the
process of erosion, transport and deposition.
(Erosión, transporte y sedimentación).

2. What would you write in each box?
Erosion
Transport
Deposition

3. 6. What external forces modify the relief?
The external forces or erosive agents are:
• Temperature
• Wind
• Rainfall
• Rivers
• Sea
• Glaciers
• Groundwater (aguas subterráneas)
• Living things (plants, animals and human beings)

4. What external force eroded this rock?
Salar de Uyuni, Bolivia

5. Balanced Rock,
Garden of the Gods
Colorado, USA

6. Boulders - South Island - New Zealand

7. Bryce Canyon National Park - Utah, USA

8. White Cliffs of Dover

9. THE CATHEDRALS´ BEACH (Lugo)

11. The Giant's Causeway - Northern Ireland, UK

16. Glacier of Alaska

17. Bear Glacier, Alaska

18. Parque Nacional de Ordesa, Aragón

19. Las Médulas