The sky reveals the movement of time more surely than the snow reveals to a hunter the tracks of his quarry. Look, you can see it, rushing past, hurtling past, even as we construct arbitrary borders to control it.

when there are certain changes there can be predictions on which part of the day we are in, either morning, afternoon or night. The cloud is more preferable in this than snow

Explanation:

It's of a certainty that the sky reveals how time can be checked. The movement of the clouds makes us believe that there is movement in how the day is running, and when there are certain changes there can be predictions on which part of the day we are in, either morning, afternoon or night. The cloud is more preferable in this than snow

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)