i believe the answer is A.) Financial Concerns
Answer:
gravel
Explanation:
because it contains large air spaces thus allowing water to pass through
Answer:
Currently, 820 million people in the world do not have enough to eat. In the past few years, the number of hungry people has been increasing rather than diminishing. Almost all the hungry people live in low- and middle-income countries.
Other 2030 research teams investigated a suite of solutions for achieving zero hunger. These involve:
Enabling employment for the future
Reducing food loss
Achieving vibrant food systems
Developing climate resilient plants
Establishing livestock feed solutions
Achieving policies for sustainable practices
Strengthening farmers organisations
We have to find a way quick other wise say goodbye to humanity.
Explanation:
PLS MARK BRAINLIEST
Geologists have recently determined that the minerals goethite and hematite exist in abundance on Mars, sure signs of the presence of water (see Figure 1 for a picture). None of those geologists have been to Mars, of course, but the unmanned rovers Spirit and Opportunity have. These rovers are equipped with three mass spectrometers, each of which is capable of determining the chemical composition of a solid with a high degree of accuracy. With such a precise chemical analysis in hand, geologists on Earth had no problem identifying the minerals.
A mineral is defined in part by a specific chemical composition. In theory, therefore, it is always easy to identify a mineral, if you can determine the chemical composition with a mass spectrometer like the Mars rovers. In reality, however, even if you are looking at rocks on Earth, determining the exact chemical composition of a substance involves significant time preparing the sample and sophisticated laboratory equipment (and often significant money). Luckily, it is usually unnecessary to go to such lengths, because there are much easier ways that require little more than a magnifying lens and a penknife.
