Article: The opening years of the 1980s saw a number of changes in personnel and direction of established hard rock acts, including the deaths of Bon Scott, the lead singer of AC/DC, and John Bonham, drummer with Led Zeppelin. Whereas Zeppelin broke up almost immediately afterwards, AC/DC pressed on, recording the album Back in Black (1980) with their new lead singer, Brian Johnson. It became the fifth-highest-selling album of all time in the US and the second-highest-selling album in the world. Black Sabbath had split with original singer Ozzy Osbourne in 1979 and replaced him with Ronnie James Dio, formerly of Rainbow, giving the band a new sound and a period of creativity and popularity beginning with Heaven and Hell (1980). Osbourne embarked on a solo career with Blizzard of Ozz (1980), featuring American guitarist Randy Rhoads. Some bands, such as Queen, moved away from their hard rock roots and more towards pop rock, while others, including Rush with Moving Pictures (1981), began to return to a hard rock sound. The creation of thrash metal, which mixed heavy metal with elements of hardcore punk from about 1982, particularly by Metallica, Anthrax, Megadeth and Slayer, helped to create extreme metal and further remove the style from hard rock, although a number of these bands or their members would continue to record some songs closer to a hard rock sound. Kiss moved away from their hard rock roots toward pop metal: firstly removing their makeup in 1983 for their Lick It Up album, and then adopting the visual and sound of glam metal for their 1984 release, Animalize, both of which marked a return to commercial success. Pat Benatar was one of the first women to achieve commercial success in hard rock, with three successive Top 5 albums between 1980 and 1982.

Question: What are some thrash metal bands?
Ans: Metallica, Anthrax, Megadeth and Slayer


Article: Because of its Catholic identity, a number of religious buildings stand on campus. The Old College building has become one of two seminaries on campus run by the Congregation of Holy Cross. The current Basilica of the Sacred Heart is located on the spot of Fr. Sorin's original church, which became too small for the growing college. It is built in French Revival style and it is decorated by stained glass windows imported directly from France. The interior was painted by Luigi Gregori, an Italian painter invited by Fr. Sorin to be artist in residence. The Basilica also features a bell tower with a carillon. Inside the church there are also sculptures by Ivan Mestrovic. The Grotto of Our Lady of Lourdes, which was built in 1896, is a replica of the original in Lourdes, France. It is very popular among students and alumni as a place of prayer and meditation, and it is considered one of the most beloved spots on campus.

Question: In what year was the Grotto of Our Lady of Lourdes at Notre Dame constructed?
Ans: 1896


Article: This has led to new terms such as cyberwarfare and cyberterrorism. More and more critical infrastructure is being controlled via computer programs that, while increasing efficiency, exposes new vulnerabilities. The test will be to see if governments and corporations that control critical systems such as energy, communications and other information will be able to prevent attacks before they occur. As Jay Cross, the chief scientist of the Internet Time Group, remarked, "Connectedness begets vulnerability."

Question: What is the disadvantage of more critical infrastructure being controlled via computer programs?
Ans: exposes new vulnerabilities


Article: Thermally, a temperate glacier is at melting point throughout the year, from its surface to its base. The ice of a polar glacier is always below freezing point from the surface to its base, although the surface snowpack may experience seasonal melting. A sub-polar glacier includes both temperate and polar ice, depending on depth beneath the surface and position along the length of the glacier. In a similar way, the thermal regime of a glacier is often described by the temperature at its base alone. A cold-based glacier is below freezing at the ice-ground interface, and is thus frozen to the underlying substrate. A warm-based glacier is above or at freezing at the interface, and is able to slide at this contact. This contrast is thought to a large extent to govern the ability of a glacier to effectively erode its bed, as sliding ice promotes plucking at rock from the surface below. Glaciers which are partly cold-based and partly warm-based are known as polythermal.

Question: What temperature determines a polar glacier?
Ans:
always below freezing point from the surface to its base