Answer: The rock is 2000785 years old.
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample
a = initial amount of the reactant = 800
x = amount of daughter isotope = 600
a - x = amount left after decay process = amount of parent isotope = (800-600) = 200
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
The rock is 2000785 years old.
Answer:
Deserts
Explanation:
A desert is a region on the earth surface with little to no rainfall all year round. Deserts also experience a wide range of temperatures daily. During the day, temperature is very high, at night, temperature falls rapidly and it is cold.
These extremes of conditions coupled with some other factors makes deserts badlands for plant growth. The soil is very lose here and contains little to no nutrients. Organic matter is non-existent due to low biodiversity.
Plants that grow in such conditions are called xerophytes. An example is cactus. They have evolved to survive and adapt to such extremes of conditions.
Examples of such deserts around the world are Sahara desert, Namib desert, Atacama desert, Kalahari desert etc.
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Answer:
plate boundaries
Explanation:
Volcanoes and earthquakes are most likely to form along plate boundaries.
Earthquakes:
An earthquake is generated when two plates move relative to each other. The earthquake itself, is the movement felt on the surface caused by the movement of the tectonic plates at their boundaries. There are a few different types of plate boundaries, NOAA does a great job giving a brief description of each here:
http://oceanexplorer.noaa.gov/facts/plate-boundaries.html
Answer:
D. to regain Roman lands that had been conquered
Explanation:
He wanted to regain the Roman Empire because it was conquered. So he had armies to battle in the West and he succeeded because he took back most of Italy and a part/parts of Africa.
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