Below are events that occurred during the early Precambrian, late Precambrian, early Paleozoic and late Paleozoic. Please order the events below from earliest (4) to youngest (1). a) During this time period sediments that will be metamorphosed and turn into the Vishnu and Brahma Schists were deposited. These units were then intruded by granite, uplifted, and eroded.
b) The rocks that were deposited during this time period contain numerous kinds of fossils including shells, trilobites, coral and other reef-dwelling organisms.
c) During this time period there were fluctuations between continental and marine settings. Deposits include limestone, shale, and sandstone.
d) Rocks deposited during this period include red sandstones and mudrocks that contain cross beds, plant fossils, and preserved lizard tracks.

Why is terracing used in southeast asian agriculture?

Scientist: cross-sections of stalactites—calcite formations deposited on cave ceilings by seeping water—can reveal annual variations in rainfall in particular areas over hundreds and thousands of years. we often found that when—according to these cross-sections—drought occurred in a particular area, it coincided with the collapse of an ancient society in that area. i hypothesize that drought reduced agricultural productivity in these areas, thereby leaving these societies without the resources needed to handle internal stresses and external threats. which of the following, if true, would most weaken the support for the scientist's hypothesis? a. many droughts indicated in the cross-sections of stalactites do not correspond with the collapse of a society in that area. b. information from the cross-sections of stalactites alone cannot reveal the level of agricultural output in an area at a particular time. c. most of the societies that collapsed during droughts did so when internal power struggles coincided with military raids from neighboring societies. d. most of the societies that collapsed during droughts maintained large stockpiles of food and water at the time of their collapse. e. information from stalactites also suggests that the collapse of some societies coincided with periods of abnormally high rainfall.

What are some of the impacts of humans on the earth?