🌍 Social ScienceUnit 1 of 68 lessons

How does the Earth change?

Explore our planet! Discover the three spheres of the Earth, find your way with hemispheres, parallels and meridians, find out why we have day and night and four seasons, and learn about volcanoes, earthquakes, tsunamis, tornadoes and hurricanes, and how to stay safe.

¡Empieza ya!

Elige una lección en la lista o empieza por el principio

Teoría ilustrada, vídeo y ejercicios interactivos en cada lección.

Empezar: What is the Earth made up of? ▸

🗂️ Study aid

The Earth at a glance

The three spheres, the natural disasters that begin in each one, and the two movements of the Earth.

💧

Hydrosphere

liquid · water on and above the surface

⚠️ tsunamis · floods · droughts

⛰️

Geosphere

solid · land on and below the surface

⚠️ volcanic eruptions · earthquakes

☁️

Atmosphere

gaseous · layer of gases around the planet

⚠️ tornadoes · hurricanes

🔄 Rotation

The Earth spins on its axis · 24 hours · day and night

☀️ Revolution

The Earth travels around the Sun · 365 days · the four seasons

🎭 Study tip: act it out!

One person is the Sun and stands in the middle. Another person is the Earth: turn around slowly (rotation: day and night) while you walk in a big circle around the Sun (revolution: the seasons). Then add a third person as the Moon, going around the Earth!

Sigue con…

🔄

Rotation: day and night

Lesson 3 · 6 min

☀️

Revolution: the four seasons

Lesson 5 · 8 min

🌋

Natural disasters in the geosphere

Lesson 6 · 7 min