What does the Tao Te Ching teach?

Which of the following was probably the most difficult challenge facing construction of the railroad?

Consider the events in alfred wegener's life that led to his development of the continental drift hypothesis. review the items below and determine whether each item is (1) an observation that led alfred wegener to develop his continental drift hypothesis, or (2) evidence wegener gathered to support his proposal.

Why is the treaty of paris (1763) important to the age of discovery/exploration?