Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

[Q]: Energy from the Sun comes from the lightest element, hydrogen, fusing together to create the second lightest element, helium. Nuclear fusion on the Sun releases tremendous amounts of solar energy. The energy travels to the Earth, mostly as visible light. The light carries the energy through the empty space between the Sun and the Earth as radiation. Solar energy has been used for power on a small scale for hundreds of years, and plants have used it for billions of years. Unlike energy from fossil fuels, which almost always come from a central power plant or refinery, solar power can be harnessed locally (Figure 1.1). A set of solar panels on a homes rooftop can be used to heat water for a swimming pool or can provide electricity to the house. Societys use of solar power on a larger scale is just starting to increase. Scientists and engineers have very active, ongoing research into new ways to harness energy from the Sun more efficiently. Because of the tremendous amount of incoming sunlight, solar power is being developed in the United States in southeastern California, Nevada, and Arizona. Solar panels supply power to the Interna- tional Space Station. Solar power plants turn sunlight into electricity using a large group of mirrors to focus sunlight on one place, called a receiver (Figure 1.2). A liquid, such as oil or water, flows through this receiver and is heated to a high temperature by the focused sunlight. The heated liquid transfers its heat to a nearby object that is at a lower temperature through a process called conduction. The energy conducted by the heated liquid is used to make electricity. This solar power plant uses mirrors to focus sunlight on the tower in the center. The sunlight heats a liquid inside the tower to a very high temperature, producing energy to make electricity. Solar energy has many benefits. It is extremely abundant, widespread, and will never run out. But there are problems with the widespread use of solar power. Sunlight must be present. Solar power is not useful in locations that are often cloudy or dark. However, storage technology is being developed. The technology needed for solar power is still expensive. An increase in interested customers will provide incentive for companies to research and develop new technologies and to figure out how to mass-produce existing technologies (Figure 1.3). Solar panels require a lot of space. Fortunately, solar panels can be placed on any rooftop to supply at least some of the power required for a home or business. This experimental car is one example of the many uses that engineers have found for solar energy. Click image to the left or use the URL below. URL: Click image to the left or use the URL below. URL:
[A]: the source of solar power is nuclear


[Q]: Chronic myeloid leukemia (CML) is arguably the best understood of all human malignancies. Its origins in the hematopoietic stem cell can be traced to a reciprocal translocation involving chromosomes 9 and 22, dubbed the Philadelphia chromosome, which is observed in essentially all patients. The resulting fusion gene, BCR/ABL, encodes an activated tyrosine kinase that can act alone to induce a CML-like syndrome in mouse models. These animal models have validated BCR/ABL as a target for the development of specific pharmaceutical inhibitors. The kinase inhibitor imatinib mesylate (Gleevec) is highly specific, effective, and minimally toxic, but may not effect cures as a single agent, particularly in patients with accelerated and blast-phase disease. Resistance to imatinib can confound therapy. Surprisingly, a high percentage of resistant cases manifest intact or augmented BCR/ABL signaling, suggesting that this oncoprotein, or signaling pathways emanating from it, remain viable targets. Combination chemotherapy is under active investigation, and among the most compelling strategies is dual treatment with agents that both target BCR/ABL signal transduction. BCR/ABL activates Ras, and compounds designed to antagonize Ras function called farnesyl transferase inhibitors (FTIs) have shown potent activity in vitro and in animal models of BCR/ABL-induced leukemia. Initial clinical trials in patients with refractory acute myeloid leukemia and CML in blast crisis have shown significant activity, suggesting that trials combining imatinib and FTIs are warranted.
[A]: What tyrosine kinase, involved in a Philadelphia- chromosome positive chronic myelogenous leukemia, is the target of Imatinib (Gleevec)?


[Q]: A volcano is a vent through which molten rock and gas escape from a magma chamber. Volcanoes differ in many features, such as height, shape, and slope steepness. Some volcanoes are tall cones and others are just cracks in the ground (Figure 1.1). As you might expect, the shape of a volcano is related to the composition of its magma. Composite volcanoes are constructed of felsic to intermediate rock. The viscosity of the lava means that eruptions at these volcanoes are often explosive. Viscous lava cannot travel far down the sides of the volcano before it solidifies, which creates the steep slopes of a composite volcano. In some eruptions the pressure builds up so much that the material explodes as ash and small rocks. The volcano is constructed layer by layer, as ash and lava solidify, one upon the other (Figure 1.3). The result is the classic cone shape of composite volcanoes. Mount St. Helens was a beautiful, classic, cone-shaped volcano. In May 1980 the volcano blew its top off in an explosive eruption, losing 1,300 feet off its summit. Mt. Fuji in Japan is one of the worlds most easily recognized composite volca- noes. Shield volcanoes get their name from their shape. Although shield volcanoes are not steep, they may be very large. Shield volcanoes are common at spreading centers or intraplate hot spots (Figure 1.4). Hawaii has some spectacular shield volcanoes including Mauna Kea, which is the largest mountain on Earth from base to top. The mountain stands 33,500 ft high, about 4,000 feet greater than the tallest mountain above sea level, Mt. Everest. A cross section of a composite volcano reveals alternating layers of rock and ash: (1) magma chamber, (2) bedrock, (3) pipe, (4) ash layers, (5) lava layers, (6) lava flow, (7) vent, (8) lava, (9) ash cloud. Frequently there is a large crater at the top from the last eruption. Mauna Kea on the Big Island of Hawaii is a classic shield volcano. The lava that creates shield volcanoes is fluid and flows easily. The spreading lava creates the shield shape. Shield volcanoes are built by many layers over time and the layers are usually of very similar composition. The low viscosity also means that shield eruptions are non-explosive. Cinder cones are the most common type of volcano. A cinder cone has a cone shape, but is much smaller than a composite volcano. Cinder cones rarely reach 300 meters in height, but they have steep sides. Cinder cones grow rapidly, usually from a single eruption cycle. These volcanoes usually flank shield or composite volcanoes. Many cinder cones are found in Hawaii. A lava fountain erupts from Puu Oo, a cinder cone on Kilauea. Cinder cones are composed of small fragments of rock, such as pumice, piled on top of one another. The rock shoots up in the air and doesnt fall far from the vent. The exact composition of a cinder cone depends on the composition of the lava ejected from the volcano. Cinder cones usually have a crater at the summit. Most cinder cones are active only for a single eruption. Click image to the left or use the URL below. URL:
[A]:
this is the largest shield volcano on earth.