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Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper, and an ice core contains ice formed over a range of years.
Cores are drilled with hand augers (for shallow holes) or powered drills; they can reach depths of over two miles (3.2 km), and contain ice up to 800,000 years old.
The physical properties of the ice and of material trapped in it can be used to reconstruct the climate over the age range of the core.
The proportions of different oxygen and hydrogen isotopes provide information about ancient temperatures, and the air trapped in tiny bubbles can be analysed to determine the level of atmospheric gases such as carbon dioxide.
Rachel Meghan Markle (born August 4, 1981) is an American actress and humanitarian who is set to become a member of the British royal family upon marriage to Prince Harry.
Markle was born and raised in Los Angeles County, California.
Impurities in the ice provide information on the environment from when they were deposited.
Radioactive elements, either of natural origin or created by nuclear testing, can be used to date the layers of ice.Markle's film credits include Remember Me and Horrible Bosses.In 2017, she became engaged to Prince Harry, the fifth in line of succession to the British throne, and announced that she would retire from acting to pursue humanitarian work given her high profile as a future royal. I have come to embrace [this and] say who I am, to share where I'm from, to voice my pride in being a strong, confident, mixed-race woman." Markle graduated in 2003 from Northwestern University, near Chicago, where she earned a bachelor's degree with a double major in theater and international studies.In 2015, she wrote: "I wasn't black enough for the black roles and I wasn't white enough for the white ones, leaving me somewhere in the middle as the ethnic chameleon who couldn't book a job." Since July 2011, Markle has played Rachel Zane on the USA Network show Suits, which is filmed in Toronto, Ontario.The character began as a paralegal and eventually became an attorney.