Here is a graphic by UNICEF describing how.
March 15 marks the third anniversary of the Syrian conflict. What started as a non-violent uprising in 2011 has since morphed into a violent Civil War pitting the regime against the opposition, and some rebel groups against each other.
A child carried water back to his home at an informal settlement for Syrian refugees, in the Bekaa Valley, Lebanon on Dec. 7, 2013.
Syria's children have born the brunt of the fighting. The United Nations Children's Fund (UNICEF) has put together the following graphic quantifying the crises these children face.
Children react next to the body of their mother, who activists said was killed by forces loyal to Syrian President Bashar al-Assad in Aleppo on Feb. 22, 2014.
Hosam Katan / Reuters
Behind the numbers, each child's story is unique. Here are the experiences of two Syrian girls collected by UNICEF staff in Jordan and Lebanon.
A girl carries a sign that says, "300 children without education for two years," as part of a campaign organized by activists in the besieged area of Homs, on Jan 22, 2014.
Yazan Homsy / Reuters