Which of the following was not an advancement created during the Han dynasty? A. the design of new water clocks and sun dials
B. the invention of paper
C. the creation of a new kind of seismograph
D. the creation of China's first system of writing

Texas’ gulf coastal plains are the western extension of the coastal plain extending from the atlantic ocean to beyond the rio grande. its characteristic rolling to hilly surface covered with a heavy growth of pine and hardwoods extends into east texas. in the increasingly arid west, however, its forests become secondary in nature, consisting largely of post oaks and, farther west, prairies and brushlands.