Now Playing: Lava snakes through trees as Kilauea volcano erupts
Now Playing: Hawaiian authorities warn Kilauea volcano could erupt
Now Playing: New eruptions from Kilauea volcano in Hawaii
Now Playing: Hawaii volcano eruption sends lava flowing through streets
Now Playing: Weekend Rewind: NRA Convention
Now Playing: Lin-Manuel Miranda discusses where relief efforts stand in Puerto Rico
Now Playing: Exclusive ‘Roseanne’ sneak peek: Roseanne confronts her neighbors
Now Playing: 2 people injured in sniper-style attack
Now Playing: Accusations made against doctor connected to NXIVM
Now Playing: College students pushed offstage at graduation
Now Playing: Trump’s CIA nominee reportedly offered to withdraw
Now Playing: Trump lawyer won’t rule out other payments to women
Now Playing: Why Hawaii’s Kilauea volcano is so dangerous
Now Playing: Hawaii volcano spews lava, toxic gases
Now Playing: Off-duty police officer pointed a gun at man buying Mentos candy
Now Playing: Boy gets his only wish granted on his 9th birthday
Now Playing: National recall on UTZ tortilla chips
Now Playing: Vaping device may have blown up in a man’s face
Now Playing: Temperatures hit triple digits from Phoenix to Las Vegas
Now Playing: Manhunt in Missouri after deadly road rage
