The legality of a flight altitude depends on various factors such as air traffic control regulations, airspace restrictions, and the specific flight plan. Pilots must adhere to the altitude restrictions set by air traffic control and comply with any airspace regulations in the area they are flying. Additionally, the aircraft's performance capabilities and the weather conditions also play a role in determining the legal flight altitude. Therefore, without specific details about the flight and the regulations in place, it is not possible to determine the legality of the flight altitude. **

The moon's altitude refers to its angular distance above the horizon. The moon's altitude changes throughout the night as it moves across the sky. At its highest point, the moon's altitude can reach around 90 degrees, which means it is directly overhead. The moon's altitude is an important factor for astronomers and navigators when determining its position in the sky. **

Altitude difference refers to the vertical distance between two points, typically measured from sea level. It is the difference in elevation between the highest and lowest points in a given area. Altitude difference is an important factor in determining the topography and terrain of a region, and it can have significant effects on weather patterns, ecosystems, and human activities such as agriculture and transportation. **

I do not have personal experiences with green energy or eco-friendly electricity as I am an AI assistant. However, I can provide information on the topic based on research and data. Green energy sources such as solar, wind, and hydroelectric power are becoming increasingly popular due to their environmental benefits and potential to reduce carbon emissions. Many individuals and businesses are making the switch to eco-friendly electricity to help combat climate change and promote sustainability. **

I don't have personal experiences with green electricity or eco-friendly electricity as I am an AI assistant. However, I can share that many people who have switched to green electricity have reported feeling good about reducing their carbon footprint and supporting renewable energy sources. They often mention that they appreciate knowing their energy consumption is not contributing to environmental harm. Additionally, some have found that green electricity options are becoming more affordable and accessible, making it easier to make the switch. **

Clouds float at various altitudes depending on their type. For example, cirrus clouds can be found at high altitudes of 20,000 feet or more, while cumulus clouds typically form at lower altitudes around 6,500 feet. Altostratus clouds are found at mid-level altitudes around 6,500 to 20,000 feet. Overall, clouds can be found floating at different altitudes in the Earth's atmosphere, ranging from low to high levels. **

The altitude at which one can survive varies depending on factors such as individual health, acclimatization, and the rate of ascent. Generally, humans can survive at altitudes up to around 18,000 feet (5,500 meters) without experiencing severe altitude sickness. However, prolonged exposure to altitudes above 26,000 feet (8,000 meters) without supplemental oxygen is not sustainable for most people due to the lack of oxygen at high altitudes. It is important to acclimatize properly and be aware of the symptoms of altitude sickness when ascending to high altitudes. **

The altitude at which one dies can vary depending on individual factors such as age, health, and acclimatization to high altitudes. However, most people cannot survive for long periods above 26,000 feet (8,000 meters) without supplemental oxygen due to the lack of sufficient oxygen in the air. At extremely high altitudes, the lack of oxygen can lead to altitude sickness, hypoxia, and eventually death. **