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1. Social sciences.
4th grade

2. Unit 1 The Earth. Imaginary
lines.
The vertical imaginary lines from the North Pole to the South Pole are
called meridians. The Greenwich meridian is the 0º one.
The horizontal imaginary lines from around the globe are called
paralells. Parallel 0º is the Equator.
Longitude is measured by meridians and latitude by parallels. We
use degrees to measure.

3. Unit 1 The Earth. Earth´s movements
ROTATION it
takes 24 hours
REVOLUTION it
takes 365 days and
6 hours

4. Unit 1 The Earth. Earth´s layers.

5. The geosphere is divided into layers:
Unit 1 The Earth. Earth´s layers.

6. The geosphere is divided into layers:
Unit 1 The Earth. Earth´s layers.