Our
Beautiful World
|
Bilde fra USGS |
Lavakupler vulkantopper av størknet
lava som tetter igjen |
1. A steep-sided mount that forms when very viscous lava is extruded from a volcanic vent. 2. A steep-sided mound that forms when viscous lava piles up near a volcanic vent. Domes are formed by andesite, dacite, and rhyolite lavas. 3. A steep-sided mass of viscous (doughy) lava extruded from a volcanic vent, often circular in plan view and spiny, rounded, or flat on top. Its surface is often rough and blocky as a result of fragmentation of the cooler, outer crust during growth of the dome. Also called: Lava dome. |
ANIMALS over 250 |
BIRDS over 500 |
FLOWERS over 225 |