Type of Volcano:
Krakatoa is a stratovolcano (composite volcano). A stratovolcano is usually a wide hill that inclines steeply towards the top. Krakatoa was formed due to small eruptions, where the runny, hot lava escaped through the earth and spread out. Every time the volcano erupts, new ash and lava covers the surface, making it bigger and bigger.
|
Rock Information:
Rock Types On Surrounding Areas (Near Krakatoa):
Java- mainly andesitic volcanic rocks Sumatra- mainly rhyolites Riau archipelago and Kalimatan- Granites and sediments Humid Regions- mainly lateritic, black or gray-black margalite soils, limestone Dry Regions- black soils (soils found near volcanoes) |
Word Definitions:
Andesitic- dark volcanic rock made mostly out of plagioclase feldspar and mafic minerals Rhyolite- a very fine igneous rock full of silica (similar to granite) Lateritic- a reddish soil formed by decomposing underground rocks (mainly formed in tropical regions) Margarite- small crystals found in glassy volcanic rocks Limestone- a sedimentary rock made mainly from calcium carbonate There are many volcanic rocks and soil in Indonesia due to all of the surrounding volcanoes. The lava, ash, and magma mix with the soil and minerals, and create volcanic soil. When the magma hardens from the volcano, it also forms solid rock.
|