Now Playing: Saharan air layer sweeps across 3,500 miles

Now Playing: WNBA star Maya Moore speaks out on Jonathan Irons’ release from prison

Now Playing: Fourth of July weekend temperatures to reach 90s and 100s across US

Now Playing: Cape Cod officials warn of Great White sharks

Now Playing: Massive wave hits couple posing for wedding photos

Now Playing: College ‘COVID parties’ under investigation

Now Playing: Trump says he hopes COVID-19 will ‘sort of just disappear’

Now Playing: FDA Commissioner speaks out on record-high cases

Now Playing: US reports record-high number of new COVID-19 cases in a day

Now Playing: Linsey Davis joins GMA's Reading Room with 'The World is Awake'

Now Playing: Photographer uses Photoshop to create socially distant class photo for 2020 graduates

Now Playing: America’s great white outdoors

Now Playing: Dallas doctors and nurses on the front lines

Now Playing: The Rundown: Top headlines today: July 1, 2020

Now Playing: Big brands boycott Facebook over hate speech

Now Playing: By the Numbers: As immigration falls, many Americans want it increased

Now Playing: NASA shares 10-year time-lapse video of sun

Now Playing: Mona monkey celebrates 31st birthday

Now Playing: Time-lapse video shows brushfire in Arizona

Now Playing: Thousands of starfish spotted in South Carolina beaches