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FInal Autoevaluation T12 05 - Waves. Light and sound
EduBook Organización
- 2029 visitas
Make calculations and answer the questions: A robot sent a signal at the speed of light from the planet Mars. It took 3 minutes to reach Earth. How far away is Mars? d = million kilometres A sound is…
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Costing the Earth: the Threat to Europe's Soils
EducaMadrid Organización
- 3483 visitas
It’s no coincidence that the word “earth” is used for both the soil and the planet we live on. Soil is vital to supporting human life on earth. Soil is literally one of the foundations for our…
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The Earth's satellite: the Moon
EduBook Organización
- 1370 visitas
3.1. General characteristics of the moon The Moon is the only natural satellite of the Earth. It is 49 times smaller than our planet. As the Moon does not have an atmosphere, the Sun's rays and the…