What type of volcano is built from alternating layers of lava and ash?

Stratovolcano

Approximately how many Native Americans attended the first Thanksgiving About how many runners annually participate in the largest Thanksgiving running events called 'Turkey Trots'? What event marked a riot after the police raid on a gay bar in New York in 1969? What artist is known for his melting clocks painting 'The Persistence of Memory'? Which device is used to observe objects underwater?