PCAs 2

Zander Chavez · 27問 · 2年前

通報

問題一覧

Over how many human produced objects are orbiting Earth?

Over 128 million

Fill in the blank: Even a ________ of cosmic junk traveling at extremely high speeds can be catastrophic.

Millimeter

What object caused significant damage to a window on the International Space Station in 2016?

A fleck of paint.

How long have we been sending satellites to space?

Over 60 years

Approximately how many satellites have been sent into Earth’s orbit?

11,000

Approximately how may satellites in Earth’s orbit are currently active?

3,300

Approximately how many satellites is SpaceX planning on launching into Earth’s orbit?

42,000

The chain reaction of one orbital crash creating debris and multiple more crashes, causing space junk to snowball out of control and make the orbital space unusable is referred to as what?

The Kessler Syndrome

Is there a way for us to clean small debris in space?

How do we currently avoid collisions with space junk?

By monitoring potential derbis with ground and satellite observatories and planning paths around debris

About how many people are caught in rip currents and must be rescued each year?

50,000

What is the common name for a strong backwash?

Undertow

Which of the follow best describes what a rip current is?

A river in the sea that can carry you beyond the breaking waves

What does a rip current look like from shore?

Rip currents come in all sizes and shapes

What is the greatest danger at a beach?

rip current

What typically causes a rip current?

a hole in the sand bar

What is the typical speed of a rip current?

about 2 to 3 feet per second

How can you escape from a rip current?

swim left or right but with the longshore current

About how many people are killed each year in the US from rip currents?

100

Which of the following kills more people on average in a year?

rip currents

What is a coral?

A small animal

What is inside the living tissue of the coral?

Single-celled plants

Why do corals bleach?

They are stressed

What conditions caused mass bleaching in corals?

Water that is too hot

Corals can sometimes recover from coral bleaching

True

What is causing rapid climate change?

The release of greenhouse gases.

How much more CO2 was emitted in 2019 compared to 2000?

50% more

What are the four factors that together can express our collective CO2 emissions and how to change it?

population size, economic growth, energy intensity and emissions per energy unit produced.

What is the prediction of what global population will level off at?

11 billion people by 2100

Why will global CO2 emissions rise over the next few decades?

The population is expected to continue to grow.

How does the carbon footprint of a US programer compare to a farmer in Uganda?

The programer's carbon footprint is 50 times larger.

In addition to an increase in emissions, what has economic growth led to?

The largest reduction in extreme proverty in human history.

What is energy intensity?

How efficiently energy is used.

What are the 3 factors why increased energy efficiency is not enough to reduce CO2 emissions?

Direct rebound, indirect rebound, return on investment

What is the CO2 emissions per kilowatt-hour of energy generated by coal power plants compared to solar power plants (gCO2/kWh)?

Solar power plants are 45 and coal power plants are 820

Where does over half the water used in Southern California come from?

Colorado River

What is the name for the area where percipitation collects and runs into a particular body of water?

Drainage basin

How many people count on the water from the Colorado River?

40,000,000

What year did the drought on the Colorado River begin?

In 2000

What is the cause of the decline in the flow of the Colorado River?

A 5% decline in precipitation and increased evaporation from higher temperatures.

Drought implies temporary low precipitation. What is the name used for a more permanent long term reduction in precipitation?

Aridification

What is the highest water use food commonly available?

Beef

What has happened to American water use since 1980?

Decreased

What food uses the least amount of water per serving?

Vegetables

It takes about 1.5 acre feet of water to grow olives. How much water does alfalfa take?

7-9 acre feet

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