Answer:
In 2002, North Korea announced that it was changing to a free market economy ( last choice).
Answer:
fastest in rivers, slowest in groundwater
Explanation:
For rivers, lakes and groundwater, self-purification is fastest in rivers and slowest in groundwater.
When groundwater becomes contaminated, it tends to remain contaminated because the dissolved oxygen levels are low or non-existent.
Geography is the study of the physical features of the Earth and its
atmosphere – including landscape development, weather and climate, and
geologic concepts – as well as the influence of human activity –
including cultural, economic, and political activity – on those physical
features. Geography students, as they study the many aspects of our
physically and culturally diverse world, tend to become more adept at
tasks that require both spatial and critical thinking skills. World
Regional Geography covers the basic elements noted above but within a
regional context. Ultimately, World Regional Geography is concerned
with the physical and human characteristics that make the regions of our
world distinctive. As you progress through the course, the units will
discuss each major world region in detail, placing particular emphasis
on cultural and societal structures. Regions will be discussed within a
global framework in the hope that you will gain a better comprehension
of how the world map is being defined and redefined. In addition, you
will study key global issues such as international conflict and
cooperation, environmental degradation, population growth, and
globalization.
One main effect of the global catastrophes was the rising temperature, also known as global climate of the earth surface.
<h3>What is a green house effect?</h3>
This is a natural process that happens when the gases in Earth's atmosphere trap the Sun's heat.
Therefore, the main effect of the global catastrophes was the rising temperature, also known as global climate of the earth surface.
Read more about green house effect
<em>brainly.com/question/2241458</em>
#SPJ1