Theme: our changing

THEME: OUR CHANGING
PLANET
Scientists believe the Earth is 4.6billionyears old. However the mountains, valleys, hills, rivers,
Desert and forests we see today are much younger than that. For example, Mount Everest is about 60 million years old and the Amazon rainforest is only 10 million years old. The youngest sea in the world I the Baltic Sea, at about 15,000 years old.
In our world have volcanoes, deserts, hills, lakes, forests, mountains, seas, oceans, islands and valleys.
Here is one of them:

This is volcanoes:
Volcano cracks in the Earth crust
gas, water vapor, and rock fragments through cracks and channels in the Earth's crust. In the center of the volcano is the main volcanic channel, through which magma and other volcanic rocks rise from the magma basin (magma chamber) in the upper mantle. The upper part of the volcanic channel is called the mouth of the volcano, and the funnel-shaped opening of the channel is called the crater.

The places in these pictures are on the planet:


Presentation
Theme:
OUR CHANGING PLANET