When the angle of a joint increases, it produces movement. which type of movement is it? extension rotation flexion revolution

It's called an Extension movement

One of the example is the joint in your elbow. If you straighten your arm, it will make the angle of the joint in your elbow to increase and create an extension movement

Another example is the joint in your hips

Little kids are eat dirt all the time so im sure you are fine

Lightning would be your answer