Answer: Mexico city is in central America
Explanation: this question is a little bit tricky since Mexico (the country) in general is located part in North America and part in Central America. However, Mexico city which is the capital of Mexico is definitely located in North America.
Answer:
9 cm per year
Explanation:
By measuring the length of the volcanic chain and the time interval between the formation of the oldest structure and the youngest structure, an average speed of plate movement can be calculated.
Answer:
The culture of Canada has been primarily influenced by the various European cultures and traditions of its constituent nationalities, particularly British and French culture. There are also influences from the cultures of its indigenous peoples, and from the neighboring USA.
Explanation:
It`s important for Canada to be involved with other countries because we can`t let people die in other countries. Also the Red Cross helps countries that have natural disasters by treating people, getting food and water, and getting shelter.
Answer:
negative growth, rapid growth, slow growth and zero growth
Explanation:
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
