Answer:
It ended during the Mesozoic era
Explanation:
The Cretaceous period is the last of three periods of the Mesozoic era. The other two are Triassic, Jurassic.
During the Cretaceous period, more birds and plants appeared, as did new types of dinosaurs. Also, the climate on the planet was getting colder.
The entire duration of the Cretaceous period was approximately 79 million years.
Rivers are divided by watershed boundaries, lines that follow the hirght og the loand and the water drians off in the opposite directions. In nature it is virtually impossible to see where oneregion of vegetation starts and ends. Natural vegetation regions gradually change through transition zones.
7) topsoil
8) subsoil
9) parent material/weathered rock
10) bedrock
11) humus = the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms
12) organic layer (very top)
13) crop rotation, contour plowing, no-till farming
The barrier that holds back water from a river is a dam
Because the British Islands are under the climatic influence of the Gulf stream (warm)