Angels come to this earth for many reasons, they can also come to rescue people in situations and appear as human like and then disappear within seconds or minutes once they have done their role of duty. Angels can hear us and they respond to us when we are in crisis of any kind, our spirit guides work with our anges and archangels to be there when they cant, when archangels are around you will know, its imposible not to know, you will feel and sense the incredible love and presence they bring and its possible to see them also, i see them on occasions, but firstly i can feel their love and warmth and protection and guidance and can hear them talking to me, if you are in trouble and you say all the archangels names, you will be fine, i do believe we all have lessons to learn in this lifetime, but we all also have to learn to love.