Quartz Sand
20,000 years ago, at the end of the last Ice Age, a voluminous amount of water comprising the world’s oceans were locked up in the great ice caps on the continents. The sea level was at the time hundreds of feet … Continue reading →
20,000 years ago, at the end of the last Ice Age, a voluminous amount of water comprising the world’s oceans were locked up in the great ice caps on the continents. The sea level was at the time hundreds of feet … Continue reading →