The top layer of sedimentary rock is the oldest. true false

False

Explanation:

With a few notable exceptions, sediment at the bottom of a layer was deposited before sediment at the top. Where rock strata (layers) remain in their original horizontal position, the bottom layer had to be deposited before the top layer. Therefore, the top layer is the youngest, and the bottom layer is the oldest.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.