TY  - GEN
AU  - Quinn,Robert
TI  - Earth: Then and now
T2  - Oxford read and discover 6
SN  - 978-0-19-464565-2
U1  - 818 / E177 
PY  - 2011///
CY  - New York
PB  - Oxford University Press
KW  - English - reading
KW  - Ingles - enseñanza
N1  - A ball of fire, cap.1  Water and air, cap.2  Minerals and rock, cap.3  Tectonic plates, cap.4  Plant life, cap.5  Animal life, cap.6  Temperature, cap.7  People on earth, cap.8
ER  -