This greenhouse gas, released by burning fossil fuels and deforestation, is the primary contributor to anthropogenic global warming.
Carbon dioxide
He delivered the Gettysburg Address during the American Civil War.
Abraham Lincoln
This country has the largest land area in the world.
Russia
This artist, known for hits like Shape of You and Perfect, holds multiple Grammy Awards and is from the UK.
Ed Sheeran
This Portuguese forward, known for his time at Manchester United, Real Madrid, and Juventus, has won multiple Ballon d’Or awards.
Cristiano Ronaldo
This is the product of an object’s mass and its velocity squared
Kinetic energy
This ancient city, located in modern-day Iraq, was the center of the Akkadian Empire and is often cited as one of the world’s first cities.
Akkad
This river, the longest in South America, flows primarily through Brazil and empties into the Atlantic Ocean.
Amazon River
This South Korean singer and actor is part of the global sensation BTS and has solo hits like Dynamite.
Jungkook
This country won the 2018 FIFA World Cup held in Russia.
France
The process by which nitrogen in the atmosphere is converted into forms usable by plants, often by bacteria in the soil, is called this.
Nitrogen fixation
This Carthaginian general famously crossed the Alps with elephants to fight Rome during the Second Punic War.
Hannibal
This island nation in the Indian Ocean is the fourth largest island in the world and is famous for its unique biodiversity.
Madagascar
This rapper’s 1996 album All Eyez on Me was one of the first double albums in hip-hop and solidified his West Coast legacy.
Tupac Shakur (2Pac)
This team, based in Los Angeles, is tied for the most NBA championships with 17 titles.
This principle, formulated by Heisenberg, states that one cannot simultaneously know the exact position and momentum of a particle.
Heisenberg uncertainty principle
This 1954 international agreement divided Vietnam at the 17th parallel after the First Indochina War.
Geneva Accords
This country in East Africa has both a coastline on the Indian Ocean and the Great Rift Valley running through it.
This rapper’s debut album Illmatic, released in 1994, is considered a hip-hop classic.
Nas
This Brazilian forward, nicknamed O Rei (The King), won three FIFA World Cups (1958, 1962, 1970).
Pelé
This enzyme synthesizes RNA from a DNA template during transcription.
RNA polymerase
This 1972 treaty between the U.S. and the Soviet Union limited the number of strategic nuclear missile launchers.
SALT I (Strategic Arms Limitation Treaty)
This peninsula is shared by Russia and Norway and is known for its Arctic climate and natural resources.
Kola Peninsula
This 18th-century composer is credited with over 600 works, including operas like The Marriage of Figaro and Don Giovanni.
Mozart
In American football, this is the term for when the quarterback is tackled behind the line of scrimmage while attempting to pass.