What do scientists call a long period of cold climate on earth?

answer the following questions.
a paleolithic age
an ice age
a neolithic age
prehistory
nextreset
©

d. it adversely affected american productivity

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.