Basalt is usually formed when lava solidifies on the earth’s surface ... causing them to change into another type of rock. They are usually resistant to weathering and erosion and are therefore ...

A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type of ... bring molten rock to the surface, which we call lava.

The type of lava erupted by Nyiragongo and many volcanoes ... of magma that cut through and across the layering of adjacent rocks and then solidify. They form when magma rises into a fissure ...