rift 
/ˈrɪft/ noun
plural rifts /ˈrɪft/ noun [count] 1 : a situation in which two people, groups, etc., no longer have a friendly relationship
▪ The fight will only widen the rift with his brother. — often + between ▪ Nothing could heal the rift between them. 2 a : a deep crack or opening in the ground, a rock, etc.
▪ the rift in the rock ▪ We could see some stars through the rifts in the clouds.
b geology : a break in the Earth's crust
▪ Scientists are studying the Mid-Atlantic Rift.
▪ The fight will only widen the rift with his brother. — often + between ▪ Nothing could heal the rift between them.
▪ the rift in the rock ▪ We could see some stars through the rifts in the clouds.
b geology : a break in the Earth's crust
▪ Scientists are studying the Mid-Atlantic Rift.
