When barium hydroxide, Ba(OH)2, mixes with water, the solution turns cold.

A threat is a weakness, but a vulnerability is an activity that represents a possible danger.

nlexa [21]

False. A threat is a possible danger. Vulnerability is a weakness.

7 0

4 years ago

Scientists studying the earths climate have discovered an increase in the earths average surface temperature. How would this mos

e-lub [12.9K]

Answer: The Arctic region is warmer than it used to be and it continues to get warmer. Over the past 30 years, it has warmed more than any other region on earth. Most scientists agree that Arctic weather and climate are changing because of human-caused climate change.

Explanation: Arctic warming is causing changes to sea ice, snow cover, and the extent of permafrost in the Arctic. In the first half of 2010, air temperatures in the Arctic were 4° Celsius (7° Fahrenheit) warmer than the 1968 to 1996 reference period, according to NOAA. Satellite data show that over the past 30 years, Arctic sea ice cover has declined by 30 percent in September, the month that marks the end of the summer melt season. Satellite data also show that snow cover over land in the Arctic has decreased, and glaciers in Greenland and northern Canada are retreating. In addition, frozen ground in the Arctic has started to thaw out. Scientists first started to see changes in the Arctic climate in the 1970s and 1980s.

3 0

4 years ago

Describe an environment that would have a low albedo. Explain where on Earth would you likely find this environment and why. Exp

AleksAgata [21]

Answer:

Albedo is a measure which shows how much incoming solar radiation is reflected by an object or surface, without being absorbed. A low albedo surface means a surface which reflects a small amount of the radiation that hits it (10%) and absorbs the rest. In the earth, the forests, oceans, soil etc have low albedo since they absorb most of the solar radiation that hits on them and reflect rest.

Explanation:

Albedo is the fraction of solar radiation that is reflected from an object or surface on the earth into space. It is a measure which shows how much incoming solar radiation is reflected by an object or surface, without being absorbed. The surface which reflects the majority of the incoming radiation (80%) and absorbs the rest is known as a high albedo surface. The surface which reflects a small amount of the radiation that hits it (10%) and absorbs the rest is known as a low albedo surface.

For example, some objects or surface that appears in light colors like snow and thick clouds reflect most of the incoming light, indicating a high albedo (90-95%) and, while something that looks dark like trees and water absorbs most of the incoming light, has a low albedo (10-15%).

In the earth, the forests, oceans, soil etc have low albedo since they absorb most of the solar radiation that hits on them and reflect rest. The forest, made of trees are dark and absorb majority of the sun light for the process of photosynthesis. It has an impact on earth’s climate in extremely complicated ways through evapotranspiration (both evaporation and transpiration), and deforestation (removing trees) may increase the albedo of an area.

The water in the ocean absorbs heat from the sun, which causes melting of large masses of ice in the ocean. As they melt, sea level rises which may result in more frequent and intense flooding.

As global temperature increases, the snow and ice melts which decreases the extent to which they cover the surface and thus decreases the earth's albedo. The decrease in albedo means more energy is absorbed, which results in further warming and in turn causes more melting.