The texture of obsidian, shown below, is best described as glassy.
why does obsidian contain few or no mineral grains?

In in 1958, the aarp was organized to promote a mandatory retirement age of 65health insurance for retired americansactivism for native americansemployment opportunities for the disabled

The political, economic, or cultural environment that surrounds an event provides the event with its

What stalled germany's initial invasion into france in 1914