Pyth, 6 bytes
VT*T\*
Body must be at least 30 characters; you entered 20.T
is 10 in Pyth, Vab
executes statement b
a
times, \*
is the asterisk character constant, and multiplying (*
) a string and an integer repeats that string n times. Pyth's implicit printing with V
means 10 lines are printed.