1) Mountains are important water sources, as they capture and store precipitation, feeding rivers and supporting ecosystems downstream.

2) Banks provide various financial products, including savings accounts, checking accounts, credit cards, mortgages, and investment services.

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

4) The Arctic Ocean is the smallest and shallowest ocean, located at the North Pole. It is covered by sea ice for much of the year.