Name four natural resources found in California.

1. Petroleum - California is home to one of the largest petroleum reserves in the United States. The state has extensive oil and gas fields, particularly in the southern region.

2. Timber - California has vast forests, particularly along the northern coast and in the Sierra Nevada Mountains. These forests provide a significant source of timber, contributing to the state's logging industry.

3. Agricultural Land - California is known as one of the most fertile agricultural regions in the world. Its rich farmland supports the production of a wide variety of crops, including fruits, vegetables, nuts, and dairy products.

4. Minerals - California has significant deposits of various minerals, including gold, silver, copper, and boron. The state's mining industry plays a crucial role in the extraction and supply of these minerals.