Q: I know that the answer to the question "Copper on earth" is in "Copper is synthesized in massive stars and is present in the Earth's crust at a concentration of about 50 parts per million (ppm), where it occurs as native copper or in minerals such as the copper sulfides chalcopyrite and chalcocite, the copper carbonates azurite and malachite, and the copper(I) oxide mineral cuprite. The largest mass of elemental copper discovered weighed 420 tonnes and was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal, with the largest described single crystal measuring 4.43.23.2 cm.". Can you tell me what it is?
A: 50 parts per million

Q: I know that the answer to the question "The estimates were not calculated in what year?" is in "The 2014 Human Development Report by the United Nations Development Program was released on July 24, 2014, and calculates HDI values based on estimates for 2013. Below is the list of the "very high human development" countries:". Can you tell me what it is?
A: 2014

Q: I know that the answer to the question "How many goals did Chelsea score in 2007" is in "Arsenal reached the final of the 2007 and 2011 League Cups, losing 21 to Chelsea and Birmingham City respectively. The club had not gained a major trophy since the 2005 FA Cup until 17 May 2014, when Arsenal beat Hull City in the 2014 FA Cup Final, coming back from a 20 deficit to win the match 32. This qualified them for the 2014 FA Community Shield where they would play Premier League champions Manchester City. They recorded a resounding 30 win in the game, winning their second trophy in three months. Nine months after their Community Shield triumph, Arsenal appeared in the FA Cup final for the second year in a row, thrashing Aston Villa 40 in the final and becoming the most successful club in the tournament's history with 12 titles. On 2 August 2015, Arsenal beat Chelsea 10 at Wembley Stadium to retain the Community Shield and earn their 14th Community Shield title.". Can you tell me what it is?
A: 2

Q: I know that the answer to the question "What are dielectrics used in?" is in "Most types of capacitor include a dielectric spacer, which increases their capacitance. These dielectrics are most often insulators. However, low capacitance devices are available with a vacuum between their plates, which allows extremely high voltage operation and low losses. Variable capacitors with their plates open to the atmosphere were commonly used in radio tuning circuits. Later designs use polymer foil dielectric between the moving and stationary plates, with no significant air space between them.". Can you tell me what it is?
A:
capacitor