Name two geographic obstacles and one political obstacle that stood in the way of the construction of the Panama Canal.
Answer: The two geographic obstacles that stood in the way of the construction of the Panama Canal was that Panama was very mountainous, and there were a lot of mud slides. One political obstacle was that Panama was part of Colombia. The united states had to negotiate with Colombia before Panama became independent. Engineers had to build a dam, design and build locks, and remove huge amounts of earth and rock in order to overcome the geographical obstacles.
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The basic force that drives plate tectonics are the convection currents.
Explanation:
The surface of Earth is cracked and divided into numerous tectonic plates. Some tectonic plates are very large, thus considered as major plates, while some are significantly smaller. There is constant motion of the tectonic plates, and they constantly move in some direction, causing the occurrence of numerous geological activities.
The tectonic plates don't just move on their own, but there is a driving force. That driving force comes from below them, from the mantle layer, in the form of the convection currents. The convection currents basically represent a circular motion (down-up), where the cooler and denser rocks sinks, while the hot and less dense ones go up, making enormous pressure on the surface.
Some of the major tectonic plates are:
- Eurasian
- North American
- African
- Pacific etc.
Some of the smaller tectonic plates are:
- Arabian
- Cocos
- Philippine
- Juan de Fuca etc.
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Answer:
People tend to define droughts in three main ways: Meteorological drought occurs when there is a prolonged time with less than average precipitation. Meteorological drought usually precedes the other kinds of drought. Agricultural droughts affect crop production or the ecology of the range.
Explanation:
Because of the need for water and other resources. Central Australia is mainly desert, and has a hot, dry climate.
Answer:
The correct option is: C) light-minute, Astronomical Unit, light-year
Explanation:
In cosmology, the distance between the objects in the universe is measured by using units such as light year, light-minute, and astronomical unit.
Here, 1 Light minute ≅ 1.8x 10¹⁰ m
1 Astronomical Unit (au) ≅ 1.49 x 10¹¹ m
1 Light year (ly) ≅ 9.46 x 10¹⁵ m
Now, arranging the units in ascending order: light-minute, Astronomical Unit, light-year.
