The correct answer is: Alfred Wegener. Alfred Wegener (1880-1930) was a German polar researcher, meteorologist and geophysicist, and a first person who suggested that the continents were once a supercontinent called Pangaea, but slowly drifted apart. While he was still alive, Wegener was best-known for his achievements in <span>meteorology and as a pioneer of polar research, but today he is most remembered as the creator of the theory of the continental drift. This idea was controversial in the beginning, but today, scientist believe that Pangaea really existed during the late Paleozoic and early Mesozoic eras.</span>
Answer:
External and Internal forces.
Explanation:
The earth's relief forms such as Mountains, Rivers, Plateaus etc, are changed because of the action of internal and external forces for example; wind, water or human activities.
Answer:
C. movement of the Earth’s plates
Explanation:
Volcanoes and earthquakes sometime occur in Canada's western ranges because of the movement of the Earth's plates.
- Plate tectonics is responsible for the volcanic activities which brings magma to surface from the asthenosphere.
- Also, earthquakes are products of plate tectonics.
- The differential movement caused sudden breakage of the plate and releases are sudden burst of energy.
Answer:
The correct answer is D
Explanation:
During the 20th century, there was an increasing interest in the environment. The impact of human activity on the environment has been observed locally since centuries. Pollution of canals and chimneys in crowded urban areas etc were all causes of concern.
However, with a better understanding of our earth and increase in Medical knowledge of the 20th century, we could observe how our activities were having a global impact on the ozone layer and the melting ice caps.
Evidence was also provided on how human health was affected by this. The use of fossil fuels was not only directly damaging to the atmosphere, it was also dangerous for humans e.g. carbon monoxide produced by car emissions.
Answer:
C. Trees with thin trunks
D. Fewer species of plants
Explanation:
If a forest has been logged once and regrew, that is a second-growth forest. Some characteristics:
- Thin tree trunks
- Fewer species of plants
- Little light reaching the forest floor
- Very high density of trees
