Apex domains cannot have CNAME records.
Question and response
Question
dig earthems.com. NS
Answer
earthems.com. 5 NS ns-370.awsdns-46.com.
earthems.com. 5 NS ns-1465.awsdns-55.org.
earthems.com. 5 NS ns-701.awsdns-23.net.
earthems.com. 5 NS ns-1935.awsdns-49.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0