Yes it is a reliable source
Explanation: it shows the earth all in one. Makes it easier to study
Earth’s atmosphere is mainly composed of nitrogen (N) and oxygen (O).
This is further subdivided into four layers according to their temperatures.
Troposphere the layer closes to the Earth's surface with 10-15 km above its
surface. Stratosphere is 15 to 50 km above the surface of the Earth and its top
is warmer than its bottom. Mesosphere extends 50
to 80 km and becomes colder with increasing altitude. <span>And thermosphere is
80 km above the surface of the Earth to outer space and is very hot.</span>
Explanation:
Fatores religiosos e sociais influenciaram muito a cultura do continente africano, embora a África mantenha muitas de suas tradições, muitas pessoas de outros países europeus ou americanos vieram com o objetivo de evangelizar, aprender e implementar novas formas de cultura social. .
Agora, a África também recebeu contribuições econômicas e políticas de países mais desenvolvidos, permitindo um grande progresso em todos esses campos nos últimos 50 anos.
I would say that in very fast moving water such as in a river, the cobble size could be transported because cobbles are 64-256mm so are quite big and in a quiescent stream won't move much but in a freshet say in a steep mountain stream they can be rolled along such as I observed in the local streams at a mining town during the Hurricane Fifi in Honduras in 1974.
