What is a potential benefit of using satellites for observation?

Using satellites for observation offers the significant benefit of continuous monitoring of Earth. This capability allows for persistent collection of data over time, which is essential for various applications such as environmental monitoring, disaster management, and climate studies. Satellites can consistently gather information across vast and sometimes inaccessible areas, enabling a comprehensive overview of changes and trends that occur on the Earth's surface.

Continuous monitoring is particularly valuable because it allows for the detection of subtle changes that may not be apparent from sporadic observations. This type of data collection supports dynamic analysis and decision-making, particularly important in fields like agriculture, urban planning, and national security, where timely and ongoing information is crucial for effective responses and strategies.

Though the other options may have their own merits, and satellites can indeed offer lower costs and detailed images in many cases, it is the unique ability to maintain a steady watch over the Earth that underscores the primary benefit of satellite observation. This makes it indispensable for a variety of applications that require an ongoing assessment of conditions and developments.