Different layers of sedimentary rocks deposited over time are referred to as
A) veins
B) strata
C) seams
D) beds
Question 2
If you were to inhale a few breaths from a helium gas balloon, you would probably experience an amusing change in your voice. You would sound like Donald Duck or Alvin the Chipmunk. What is the cause of this curious high-pitched effect?
A) The helium causes your vocal cords to tighten and vibrate at a higher frequency.
B) For a given frequency of vibration of your vocal cords, the wavelength of sound is less in helium than it is in air.
C) Your voice box is resonating at the second harmonic, rather than at the fundamental frequency.
D) Low frequencies are absorbed in helium gas, leaving the high frequency components, which result in the high, squeaky sound.
E) Sound travels faster in helium than in air at a given temperature.
Coronary artery bypass graft (CABG). The grafts are often obtained from the patient’s saphenous vein
Results from sequential study of two cohorts tested at three ages and at three different points in t
Time
Major veins of the body. Apply deep flushing effleurage to the arms and legs from distal to ...
Layers of the heart
The Geologic Time Scale