Main article: Roseanne Conner. Played by Roseanne Barr. Roseanne, in a takeoff of her stand-up comedic and presumed real-life persona, is a bossy, loud, caustic, overweight, and dominant woman. She constantly tries to control the lives of her sister, husband, children, co-workers, and friends.
Where Does Volcanic Activity Occur? Myth: Most of the Earth's igneous rocks are produced at the Ring of Fire.. Fact: 70% of the Earth's surface is ocean floor, which is made of basalt, an igneous rock produced at mid-ocean ridges. The ridges are the most volcanically active features on the planet. Plate boundary volcanism. Volcanic activity occurs at two types of plate boundaries: mid-ocean ridges and subduction zones. At mid-ocean ridges, basaltic eruptions produce new sea-floor crust. These underwater eruptions don't produce big mountainous volcanoes, which is why they are often overlooked as the most volcanically active features on Earth.
Large geodes of amethyst occur in basalts in southern Brazil and northern Uraguay. The color of amethyst is the result of radiation damage to Fe3+ in the interstitial site of quartz. The radiation could be due to gamma rays from 40K. Current theory says that the ferric iron is oxidized to Fe4+ by the gamma rays. Amethyst geodes in basalt near the town of Ametista do Sul, Rio Grande do Sul, Brazil.