VERTICAL SCALE
HIGHLY EXAGGERATED
OC
EA
NI
C
SP
1
RE
14
AD
IN
G
TR
EN
CH
RI
DG
E
11
Magma
source
6
5
7
8
OCE
ANI
C
ASTHENOSPHERE
2
4
100 km
ASTHENOSPHERE
9
Magma
source
LIT
HO
12
SP
HE
RE
13
CONTINENTAL
LITHOSPHERE
ASTHENOSPHERE
(semi-solid, slowly
flowing upper mantle)
3
LOWER MANTLE
100 km
10