The document discusses the Earth's imaginary lines, movements, and layers. It describes how the Earth is divided into vertical meridians and horizontal parallels used to measure longitude and latitude in degrees. It notes that the Earth's rotation takes 24 hours and revolution around the sun takes 365 days and 6 hours. Finally, it states that the geosphere, or solid part of the Earth, is divided into layers.

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.