Answer:
- United States
- Canada
Explanation:
As per the question, the two countries that concluded the construction of 'St. Lawrence Waterway' would be the United States, as well as, Canada. The waterway construction began in the year 1954 and took five long years and it was completed in 1959. The project was a joint venture between the U.S. and Canada which is an arrangement of several channels, waterways, and locks that allows the easy travelling of ships towards the Great Lakes located in Northern America from the Atlantic Ocean. The seaway is elongated for 595 Km beginning from Montreal to Port Colborne.
Answer:
Some, but not all, earthquakes are related to volcanoes. ... However, most earthquakes are caused by the interaction of the plates not the movement of magma . Most earthquakes directly beneath a volcano are caused by the movement of magma. The magma exerts pressure on the rocks until it cracks the rock.
The correct answer to this question is: colonization.
Answer:
Human activity - Produces greenhouse gasses.
Greenhouse gasses - Cause atmosphere to trap more heat.
Sun's output - Can vary.
Ice age - Peaked 20,000 years ago.
Explanation:
Human activity includes the usage of fossil fuels on a very large scale, and by using them we release huge amounts of greenhouse gasses into the atmosphere.
The greenhouse gasses have the ability to trap the heat that is reflected from the surface of the planet, thus keeping more of it in the atmosphere and causing global temperature rise.
The sun is technically a star, thus an object that produces energy and light, and like every star, it has variations in its activity in accordance with the processes going on on it.
There have been numerous ice ages through the geological past, and the last one of them ended only around 10,000 years ago, with its peak being just 20,000 years ago.
