TASK DEFINITION: In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".
PROBLEM: If you build a campfire, you start with a large stack of sticks and logs. As the fire burns, the stack slowly shrinks. By the end of the evening, all that is left is a small pile of ashes. What happened to the matter that you started with? Was it destroyed by the flames? It may seem that way. What do you think happened? The truth is that the same amount of matter still exists. The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases. The gases floated off into the air, leaving behind just the ashes. Although matter was changed, it was not created or destroyed. Because the same amount of matter still exists, we can say that matter is conserved. You may wonder how it can be conserved if something is now missing? Assume you had measured the mass of the wood before you burned it. Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes. What would you find? The ashes and gases combined have the same mass as the wood you started with. This example illustrates the law of conservation of mass. <sep>What is left when the stack shrinks?<sep>A small pile of ashes

SOLUTION: Yes

PROBLEM: Spain's Golden Age: Under Ferdinand and Isabella, Spain underwent a dramatic transformation. In 1492 the royal pair presided over the final conquest over the Moors and discovery of the New World, including the great wealth that feat brought to Spain. Spain flourished during a Golden Age, a century of Spanish economic and political supremacy in international affairs, accompanied by marvels of art and literature. Ferdinand and Isabella were consummate Spaniards, committed to the expansion of the crown. By contrast, their grandson, who assumed the throne in 1516, was born in Flanders in 1500, and Charles I could barely express himself in Spanish. The first of the Habsburgs, he packed his retinue with Burgundian and Flemish nobles. Soon after his arrival in Spain, the young man inherited the title of Holy Roman Emperor, as Charles V. The responsibilities of the crown kept him busy away from the royal residences of Toledo, Segovia, Valladolid, and Madrid. While the monarch was away on one of his many business trips, his increasingly dissatisfied subjects protested violently. A revolt of the comuneros, or townsmen, broke out in a number of Spanish cities, including Madrid. The rebels occupied the alcazar, which had by then been converted to a royal palace. The insurrection was quashed and its leaders executed, but the king got the message. He tried thereafter to pay more attention to his Spanish constituency. <sep>Who were the grandparents of the individual that assumed the throne in 1516?<sep>Donnie and marie

SOLUTION: No

PROBLEM: The inhabited history of the Las Vegas Valley stretches to 23,000 b.c. , when much of the area was covered by a prehistoric lake. During this period, the indigenous people lived in caves, hunting the mammals that gathered at the shoreline. The landscape of the valley changed dramatically over the next 200 centuries. The glaciers feeding the lake melted away and the lake evaporated. Fossils tell an obscure story of man's slow and sporadic development. Around 3000 b.c. , native Archaic Indians began to develop a lasting hunting and gathering culture. By this time, the valley was in much the same geographic state as it exists in today, with one exceptionthe presence of artesian springs that bubbled to the surface in several areas. These springs fed a network of streams draining through the Las Vegas Wash to the Colorado River. The areas surrounding the springs were desert oases: sprawling collections of grasses, trees, and wildlife. Many springs lay in areas that would eventually become the center of the modern Las Vegas metropolis. For about 4000 years, the Archaics thrived in a culture that included many signs of early civilization. Signs of even more advancement appeared halfway through the first millennium a.d. , when the Anasazi Indians inhabited the valley. Far more progressive than the Archaics, the Anasazi utilized such formal agricultural techniques as irrigation to assist their harvest. This permitted the Anasazi to achieve a benchmark of advanced societythe ability to live in permanent shelters year-round without need to follow wildlife. Mysteriously, the Anasazi vanished from the valley around a.d. <sep>When does Las Vegas history begin and what covered most of the area?<sep>Prehistoric lake

SOLUTION:
Yes