Since the very beginning of the Jewish people thousands of years ago, although many options were available, Jews have always insisted on burial.
Jewish law (“Halachah”) is unequivocal that the dead must be buried in the earth.
Clink on the links below to access the resources outlining the need for a Jewish Burial.
Why Bury (by Doron Kornbluth)
Burial versus cremation (by Rabbi David Freedman)
Burial, cremation and the environment (by Doron Kornbluth)
Misconceptions about Cremation (by Doron Kornbluth)
Kaddish (by Doron Kornbluth)