I think its to make it harder to get through and some of them are the insides of a mountain.
Several has to be the subject since 'of the caves' is a prepositional phrase and 'are open' is the verb.
Underwater caves are natural formations in the ocean or a body of water that have been eroded or carved out by the movements of water over time. These caves can vary in size and shape and often contain unique ecosystems and marine life. Some underwater caves are popular destinations for divers due to their beauty and diversity of marine species.
I take elevation to mean altitude? There isn't a common elevation as limestone (karst) caves are found from below sea-level (drowned by rising sea-levels having formed in times of lower levels) to a few thousands of metres altitude. However their main development controls are the regional geology, hydrology and long-term climate, and these tend to limit caving areas to modest elevation.
Compound relict caves are a type of cave system that has multiple levels and passages, typically formed through a combination of erosion and tectonic processes. These caves often have intricate networks of chambers and tunnels, creating complex underground environments.
Yes, the Bandera Pass area in Texas has several caves, including the Bandera Ice Cave and the Cave Without a Name. These caves are popular attractions for visitors looking to explore underground formations.
Connected caves are called cave systems. These systems occur when several cave passages interconnect and form a complex network of underground tunnels and chambers.
Oxygen levels can be lower in caves due to factors such as limited air flow, vegetation, or microbial activity to produce oxygen. In closed-off or deep caves, oxygen may not be replenished as quickly as it is consumed by animals and microbial life, leading to lower oxygen levels.
The Ellora Caves were not founded by a single individual, but rather by various dynasties over several centuries. These caves were built between the 6th and 10th centuries and encompass Buddhist, Hindu, and Jain rock-cut temples and monasteries.
Caves provide a stable environment with consistent temperature and humidity levels, protecting paintings from extreme fluctuations that can cause deterioration. The darkness of caves shields paintings from light damage, such as fading or color changes. Additionally, caves are usually secluded and provide a natural barrier to protect against vandalism or human interference.
Rocks are added to aquascape/landscape a tank. They can be used in many ways to suit your own design. I often use them to build retaining walls and bank gravel up behind them to make several different levels in a tank. They can also be placed one on top of several to make caves or tunnels etc.
You can find Deinos (Levels 38-40) in the caves in Victory Road
It is a purchase not a subscription. The subscription is called Office365 and there are several levels.