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: Fossils can be used to match up rock layers. As organisms change over time, they look different. Older fossils will look different than younger fossils. Some organisms only survived for a short time before going extinct. Knowing what organisms looked like at certain times also helps date rock layers. Some fossils are better than others for this use. The fossils that are very distinct at certain times of Earths history are called index fossils. Index fossils are commonly used to match rock layers. You can see how this works in Figure 2.30. If two rock layers have the same index fossils, then they're probably about the same age. <sep>How are fossils used to match up rock layers?<sep>They match the mineral deposits

SOLUTION: No

PROBLEM: General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum. Noether's theorem allows these quantities to be determined from a Lagrangian with translation invariance, but general covariance makes translation invariance into something of a gauge symmetry. The energy and momentum derived within general relativity by Noether's presecriptions do not make a real tensor for this reason. Einstein argued that this is true for fundamental reasons, because the gravitational field could be made to vanish by a choice of coordinates. He maintained that the non-covariant energy momentum pseudotensor was in fact the best description of the energy momentum distribution in a gravitational field. This approach has been echoed by Lev Landau and Evgeny Lifshitz, and others, and has become standard. The use of non-covariant objects like pseudotensors was heavily criticized in 1917 by Erwin Schrodinger and others. <sep>When did the standard approach to energy momentum become criticized?<sep>1911

SOLUTION: Yes

PROBLEM: Alien Planet starts out with an interstellar spacecraft named Von Braun , leaving Earth's orbit .  Traveling at 20 % the speed of light , it reaches Darwin IV in 42 years .  Upon reaching orbit , it deploys the Darwin Reconnaissance Orbiter , Which looks for potential landing sites for the probes .  The first probe , Balboa , explodes along with its lifting body transport during entry , because one of its wings failed to unfold .  Two backup probes , Leonardo da Vinci and Isaac Newton , successfully land on the planet , and learn much about its bizarre indigenous lifeforms , including an apparently sapient species .  The robotic probes sent out to research on Darwin IV are called Horus Probes .  Each Horus probe consists of an { { convert } } long inflatable , hydrogen-filled balloon , Which is covered with solar receptors , a computer ` brain ' , a ` head ' covered with sensors , and several smaller robots that can be sent to places too dangerous for the probes themselves .  The probes have a limited degree of artificial intelligence , very similar to the ` processing power ' of a 4-year-old .  All the real thinking is done by a supercomputer in the orbiting Von Braun .  The probes are programmed with different personalities ; Ike is more cautious , while Leo is the risk-taker .  The two probes are also equipped with a holographic message that will be projected to any sentient life found on Darwin .  After the two probes inflate their gas-bags , they encounter a voracious Arrowtongue and watch it pursue a Gyrosprinter . <sep>How long does it take Von Braun to reach Darwin IV?<sep>It takes 42 years

SOLUTION:
Yes

