Information: - Morro Bay State Park is a state park on the Morro Bay lagoon, in western San Luis Obispo County, central California. On the lagoons northeastern and eastern edges in the park, there are saltwater and brackish marshes that support thriving bird populations. - State or provincial parks are parks or other protected areas managed at the sub-national level within those nations which use "state" or "province" as a political subdivision. State parks are typically established by a state to preserve a location on account of its natural beauty, historic interest, or recreational potential. There are state parks under the administration of the government of each U.S. state, and of some the Mexican states. The term is also used in the Australian state of Victoria. The Canadian equivalent term is provincial park. Similar systems of local government maintained parks exist in other countries, but the terminology varies. - Morro Bay is a waterfront city in San Luis Obispo County, California. As of the 2010 census, the city population was 10,234, down from 10,350 at the 2000 census. - San Luis Obispo County, officially the County of San Luis Obispo, is a county located in the U.S. state of California. As of the 2010 census, the population was 269,637. The county seat is San Luis Obispo. - California is the most populous state in the United States and the third most extensive by area. Located on the western (Pacific Ocean) coast of the U.S., California is bordered by the other U.S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. The state capital is Sacramento. Los Angeles is California's most populous city, and the country's second largest after New York City. The state also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County. - A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of pressure if rising volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. Glacial erosion can lead to exposure of the plug on one side, while a long slope of material remains on the opposite side. Such landforms are called crag and tail. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive upstanding landform. - Black Hill is a hill in Morro Bay , California . It is a part of Morro Bay State Park . The hill is the second to last in a series of volcanic plugs called the Nine Sisters . The west side of Black Hill is accessible by a trail that goes all the way to the top . The road to the trail is officially open during the day , but the opening and closing of the gate is unreliable . Black Hill is rumored to have received its name because of a tar seep on the north side of the hill . - Brackish marshes develop by salt marshes where a significant freshwater influx dilutes the seawater to brackish levels of salinity. This commonly happens upstream from salt marshes by estuaries of coastal rivers or near the mouths of coastal rivers with heavy freshwater discharges in the conditions of low tidal ranges. - The Nine Sisters or the Morros are a chain of nine volcanic mountains and hills in western San Luis Obispo County, central California. They run from Morro Bay east through San Luis Obispo. - A crag (sometimes spelled cragg, or in Scotland craig) is a rocky hill or mountain, generally isolated from other high ground. Crags are formed when a glacier or ice sheet passes over an area that contains a particularly resistant rock formation (often a granite, volcanic plug or some other volcanic structure). The force of the glacier erodes the surrounding softer material, leaving the rocky block protruding from the surrounding terrain. Frequently the crag serves as a partial shelter to softer material in the wake of the glacier, which remains as a gradual fan or ridge forming a tapered ramp (called the tail) up the leeward side of the crag. After reading the paragraphs above, we are interested in knowing the entity with which 'black hill ' exhibits the relationship of 'instance of'. Find the answer from the choices below. Choices: - administration - area - bay - border - capital - chain - city - coast - county - government - local government - mountain - nine - ocean - population - provincial park - salinity - salt - state - state park - subdivision - term - the city
The answer to this question is:
mountain