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211) What was the first spacecraft to land on Mars?

Viking 1 was launched from the Kennedy Space Center, on August 20, 1975. It went into orbit around Mars on June 19, 1976. The lander touched down on July 20, 1976 on the western slopes of Chryse Planitia (Golden Plains).

212) What is the most prominent crater on the Moon?

Tycho is a relatively young crater, with an estimated age of 108 million years. It is surrounded by a distinctive ray system forming long spokes that reach as long as 1,500 kilometers.

213) What color is on the outside arc of a rainbow?

The arc of a rainbow appears as a composition of colors, including red on the outside and violet on the inside.

214) What is the most earthquake-prone state?

Alaska is the most earthquake-prone state and one of the most seismically active regions in the world. Alaska experiences a magnitude 7 earthquake almost every year, and a magnitude 8 or greater earthquake on average every 14 years.

215) What vitamin does E. coli produce?

The harmless strains of E. coli are part of the normal flora of the gut, and can benefit their hosts by producing vitamin K.

216) What is the world's hottest chili pepper?

The Carolina Reaper has been certified as the world's hottest chili pepper by Guinness World Records since August 7, 2013. The original crossbreed was between a Ghost pepper (a former world record holder) and a red habanero.

217) What natural pigment is the primary determinant of skin color in humans?

Melanin is also found in hair, the pigmented tissue underlying the iris of the eye, and the stria vascularis of the inner ear.

218) How many earthquakes are there in southern California each year?

Each year, southern California has about 10,000 earthquakes. Most of them are so small that they aren't even felt. Only several hundred are greater than magnitude 3.0, and only about 15-20 are greater than magnitude 4.0.

219) What does the human stomach use to digest food?

Gastric acid is one of the main secretions of the stomach. It consists mainly of hydrochloric acid and acidifies the stomach content to a pH of 1 to 2.

220) What is the main chemical ingredient in poison ivy?

Urushiol oil is what causes the painful rash in most people who touch poison ivy. Only one-billionth of a gram of urushiol oil is needed to cause a rash!