basalt

What Asteroid 2004 BL86 and Hawaii Have in Common

At first glance, you wouldn't think Hawaii has any connection at all with asteroid 2004 BL86, the one that missed Earth by…

10 years ago

Basalt

[/caption] Basalt is a hard, black volcanic rock with less than 52% silica. Because of this low silica content, basalt…

16 years ago