Answer the following question given this paragraph: There are times in Earth history when all of the continents come together to form a supercontinent . Supercontinents come together and then break apart. Pangaea was the last supercontinent on Earth, but it was not the first. The supercontinent before Pangaea is called Rodinia. Rodinia contained about 75% of the continental landmass that is present today. The supercontinent came together about 1.1 billion years ago. Rodinia was not the first supercontinent either. Scientists think that three supercontinents came before Rodina, making five so far in Earth history. Q: What was the last supercontinent on earth? Choices: - rodinia - laurasia - eurasia - pangaea A:
pangaea
Answer the following question given this paragraph: Because energy is a product, energy is given off by the reaction. Therefore, this reaction is exothermic. Because energy is a reactant, energy is absorbed by the reaction. Therefore, this reaction is endothermic. Q: In an endothermic reaction, what is absorbed by the reaction? Choices: - food - fuel - atoms - energy A:
energy
Q: Answer the following question given this paragraph: Q: What is the term for many different types of animals within the same species? Choices: - pollution - habitat - differentiation - diversity A:
A: diversity
Question: Answer the following question given this paragraph: Electrons are one of three main types of particles that make up the atom. They are extremely small and have an electric charge of -1. All atoms have the same number of electrons as protons. Q: All atoms have equal numbers of what two particles? Choices: - nuclei and neutrons - photons and protons - electrons and neutrons - electrons and protons A:
Answer: electrons and protons
*Question*
Answer the following question given this paragraph: perpendicular to the surface at the point where the ray strikes the surface. Q: Desert plants have evolved processes to conserve water and deal with harsh conditions. a more efficient use of co2 allows plants to adapt to living with what? Choices: - less competition - more water - more sunlight - less water A:
**Answer**
less water
Answer the following question given this paragraph: The rare earth metals are a set of seventeen chemical elements (the lanthanide series plus scandium and yttrium) that have particular importance for a variety of industrial processes and are used frequently in modern technology. Despite their name, rare earth metals are actually relatively abundant in the earth's crust. However, the extraction of many of these metals is quite difficult and has made their supply somewhat limited. They are highly sought after for this reason. Figure below shows the rare earth metals. Q: What do you call the set of seventeen chemical elements possessing particular importance for a variety of industrial processes, used frequently in modern technology? Choices: - base chemicals - fossil fuel - reactive elements - rare earth metals A:
rare earth metals