Sedimentary rocks are useful records of past time because of
1.their unique colors
2.the minerals found in them
3.their volcanic origin
4.their layered structure

Sedimentary rocks are useful records of past time because of their layered structure. Hope this helps!

Answerbecause of improved transportation, communication, and other advantages;

Mexico has a host of environmental problems, including significant chemicalpollution  from factory discharges and waste dumping, but the main threat to itsbiodiversity  probably stems from  deforestation  and other natural habitat losses. forest habitat is lost for a number of reasons