An echo occurs when sound
A. is transmitted through a surface
B. is reflected from a distant surface
C. changes speed when it strikes a distant surface
D. All of the above
E. None of the above

Which boundary is associated with the building of the himalaya mountains? convergent transform divergent hot spot

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k