Why does my iPhone take ten photos in a row?

Because time-lapse photography is a photography mode, it is also called time-lapse photography (English), which is a shooting technique to compress time. It takes a group of photos or videos, and then through photo stitching or video frame extraction, it compresses the process of minutes, hours or even days and years into a short period of time and plays it out in the form of video. In time-lapse photography video, the slow change process of an object or scene is compressed into a very short time, showing a strange and wonderful scene that is usually imperceptible to the naked eye. Time-lapse photography can be regarded as the opposite of high-speed photography. Time-lapse photography is usually used to shoot urban scenery, natural scenery, astronomical phenomena, urban life, architectural manufacturing, biological evolution and other topics. The process of shooting time-lapse photography with a camera is similar to making a freeze frame, which connects single still pictures in series to get a dynamic video. That's why there are so many photos.