Volcanic rock has often been found early in the rock record by less frequently in later rock layers. what does this suggest to scientists about early earth? a volcanic rock is easier to find b volcanic rock is more easily preserved than other kinds of rock c volcanic activity was more common in the past than it is today d volcanic activity is the same today as it was early in earth's history

Which sequence of transformations on preimage ∆abc will not produce the image ∆a'b'c'? a. reflection across the line y = x b. rotation 180° clockwise about the origin followed by a reflection across the line y = -x c. reflection across the x-axis followed by a reflection across the y-axis d. reflection across the line y = -x followed by a rotation 180° counterclockwise about the origin e. reflection across the y-axis followed by a rotation 90° clockwise about the origin

In the diagram below dab and dac are adjacent angles

In the diagram, δgef and δhef are congruent. what is the value of x?