A glacier is a large, permanent (non-seasonal) mass of ice that is formed on land and moves under the force of gravity.
(A glacier; is; a large, permanent (non-seasonal) mass of ice that is formed on land and moves under the force of gravity) (a large, permanent (non-seasonal) mass of ice; is formed; L:on land and moves under the force of gravity)
A glacier a large, permanent (non-seasonal) mass of ice
is is formed
a large, permanent (non-seasonal) mass of ice that is formed on land and moves under the force of gravity
L:on land and moves under the force of gravity