1) The word "banana" contains three vowels: A, A, and A.

2) The Earth's core is hotter than the surface of the Sun.

3) The Scottish Highlands, located in the northern part of Scotland, are characterized by rugged landscapes, mountains, and lochs (lakes). They are known for their natural beauty, rich history, and cultural heritage, attracting outdoor enthusiasts and those seeking tranquility in nature.

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