Pangaea supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and began to break apart about 175 million years ago.

Seismic wave is wave of energy that travel through Earth's layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions.

Frederic Chopin is a French composer. He is sometimes seen as the first Impressionist composer, although he vigorously rejected the term. He was among the most influential composers of the late 19th and early 20th centuries

Music that uses tape recorder is called Musique Concrete.

Cage is the father of modern music

Humanity is a branch of social science that studies how people interact with value; in particular, the production, distribution, and consumption of goods and services.

Explanation clues are hints found within a sentence, paragraph, or passage that a reader can use to understand the meanings of new or unfamiliar words

ax² + bx + c = 0 is the formula of Pythagorean Theorem.

Avogadro's number is equal to 6.02214076 × 10²³.