Simplify the following text for a Grade 6 native English-speaking person.
Original: Opinion surveys show that the South Korean public do not consider hanja literacy essential , a situation attributed to the fact that formal hanja education in South Korea does not begin until the seventh year of schooling . Hanja terms are also expressed through hangul , the standard script in the Korean language .
Simplified: Children in Korea still learn hanja , for many Korean words still have roots in hanja .