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

Physics & Space Science

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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.

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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

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What type of nebula is the Horsehead?

a. Primitive b. Bright emission c. Bright reflection d. Dark

Physics & Space Science

The largest units of geologic time are the

a. eons. b. periods. c. eras. d. epochs.

Physics & Space Science