The type of fossilization that occurs when the remains of an organism are replaced by mineral matter is called
A) carbonization.
B) replacement.
C) an impression.
D) a cast.
Answer: B
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An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor
At time t = 0 the voltage is zero. At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, where Imax is the current amplitude. What is the unknown element? A) a resistor B) an inductor C) a capacitor D) an inductor or a capacitor
The largest units of geologic time are the
a. eons. b. periods. c. eras. d. epochs.
What type of nebula is the Horsehead?
a. Primitive b. Bright emission c. Bright reflection d. Dark
A pane of glass having transmissivity of 0.8 between wavelengths of 0 to 4 ?m and 0 above 4 ?m is subjected to direct radiation from the sun on one side and from a room on the other side. Assume that the sun is a black body at 6000 K and the room is a black body at 300 K. Determine the net radiation through the glass.
