Which statement best describes an index fossil?
a. a fossil that can be used to establish the absolute age of a rock layer
b. a fossil which is formed in a soft sediment by the movement of an animal
c. a fossil of an insect captured in amber
d. a fossil of an animal captured in ice

Movement that is like a t a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. transfers energy from one location to another a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave