More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is …

2024年1月28日 · Basalt rock is fine-grained, dark-colored volcanic rock with essentially Mg-rich plagioclase and augite. It is basic or low in silica (42-52 wt. %) mafic (Mg- and Fe-rich) rock, …

2023年4月23日 · Basalt is a mafic volcanic rock that forms from the solidification of basaltic magma and exhibits a characteristic fine-grained texture. Its composition, texture, and …

Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium. Basalts may be broadly classified on a chemical …

2024年1月4日 · Most Common Volcanic Rock: Basalt is the most abundant volcanic rock type on Earth’s surface, accounting for most of the oceanic crust and large parts of the continental …

The volcanic cone grew as recurrent eruptions built up layer after layer of basalt flows. About 100,000 years ago it is thought to have grown tall enough to emerge from the ocean as an …

2024年11月12日 · Basalt is one of Earth’s most abundant and widely distributed volcanic rocks, known for its dark color and dense structure. Formed from the rapid cooling of lava at or near …

2024年4月10日 · Basalt is a massive, dense, fine-grained, dark-colored volcanic rock with mainly calcic plagioclase, augite, and other minor minerals.

Volcanic rock (or lava) that characteristically is dark in color (gray to black), contains 45 to 53 percent silica, and is rich in iron and magnesium. Basaltic lavas are more fluid than andesites …

Basalt is a mafic (dark) igneous, extrusive volcanic rock. As such, basalt may be vesicular (containing small cavities) and brecciated (having angular fragments). It is typically hard, tough …