1) The Amazon rainforest produces more than 20% of the world's oxygen.

2) The signing of the Magna Carta in 1215 laid the foundation for modern democratic principles and limited the powers of the monarchy in England.

3) The word "yesterday" contains three vowels: E, A, and A.

4) The ocean is home to an incredible variety of marine life, including thousands of species of fish, mammals, reptiles, and invertebrates.