HOMEEarth and usLet's will investigate a mountain.Let's summarize

Let's summarize

What we will learn

  • This is the summary of what we have learned.

Form like a circular corm.

Let's compare with the sectional view of the mountain outside the prefecture where the form is alike.
The name of a mountain Mt. Iino (Kagawa Prefecture) Mt. Fuji
Sectional view
Difference Andesite has got almost horizontally on a granite. A volcanic vent (way along which lava passed) is not seen. It is a volcano under activity still now. Most is made of lava and they have overlapped with dozens along the slope. A volcanic vent is seen.
Summary
　"Andesite" - "granite" seen with the sectional view of Mt. Iino is both an eruptive rock. However, a "granite" is an abyssal rock made underground and "andesite" is an eruptive rock made the ground and near surface of the earth. However, a "granite" is an abyssal rock made underground and "andesite" is an eruptive rock made the ground and near surface of the earth. The land weathered, and was deleted by wind and rain etc., and the mountain of a form like present Mt. Iino was made (Mt. Fuji became the above forms because lava flowed out).

Form like a trapezoid.

Let's compare with the sectional view of the mountain outside the prefecture where the form is alike.
The name of a mountain Yashima (Kagawa Prefecture) Mt. Mihara
Sectional view
Difference Rock is distributed almost horizontally on a granite. The friend of very hard andesite is distributed on No. 1.A volcanic vent is not seen. It is a volcano under activity still now.Lava is distributed along a slope. As for rock, weak basalt of stickiness is distributed widely. A volcanic vent is seen.
Summary
　It is the eyeshine which can both do "andesite" -"Tufa" - "granite" seen with the sectional view of Yashima in work of a volcano. However, a "granite" is an abyssal rock made underground, "Tufa" is pushed and hardened, and can do a volcanic product and "andesite" is an eruptive rock made the ground and near surface of the earth. That is, the ground of the land which had volcanic activity a long time ago upheaved, and the rock by another volcanic activity from it accumulated.The structure understood from the sectional view of Yashima resembles Mt. Iino. That is, it is thought that it becomes a form like a cone in the future although Yashima has a form like a trapezoid now.

Conclusion

  • Geographical feature of Kagawa Prefecture seen now was mainly made by "volcanic activity" -"upheaval" - "weathering." "
  • Moreover, it is thought by upheaval, weathering, etc. in the future that geographical feature changes further.
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NATURE TRAVEL by team130133 is licensed under a Creative Commons Attribution-NonCommercial 2.1 Japan.