Answer the following question given this paragraph: Some extrusive igneous rocks cool so rapidly that crystals do not develop at all. These form a glass, such as obsidian. Others, such as pumice, contain holes where gas bubbles were trapped in the lava. The holes make pumice so light that it actually floats in water. The most common extrusive igneous rock is basalt. It is the rock that makes up the ocean floor. Shown below are three types of extrusive igneous rocks ( Figure below ). Q: What helps pumice float in water? Choices: - high density - large mass - gravity - gas bubble holes A:
gas bubble holes
Answer the following question given this paragraph: Atoms are electrically neutral, but if they lose or gain electrons they become charged particles called ions. Q: What do atoms become if they lose or gain electrons? Choices: - toxins - particles - particulates - ions A:
ions
Q: Answer the following question given this paragraph: Archaeplastida Red algae and green algae are included in the supergroup Archaeplastida. It was from a common ancestor of these protists that the land plants evolved, since their closest relatives are found in this group. Molecular evidence supports that all Archaeplastida are descendents of an endosymbiotic relationship between a heterotrophic protist and a cyanobacterium. The red and green algae include unicellular, multicellular, and colonial forms. Red Algae Red algae, or rhodophytes, are primarily multicellular, lack flagella, and range in size from microscopic, unicellular protists to large, multicellular forms grouped into the informal seaweed category. The red algae life cycle is an alternation of generations. Some species of red algae contain phycoerythrins, photosynthetic accessory pigments that are red in color and. Q: In which supergroup are red algae and green algae included? Choices: - xerophyte - spirogyra - troglodyte - archaeplastida A:
A: archaeplastida
Question: Answer the following question given this paragraph: After each mass extinction, new species evolve to fill the habitats where old species lived. This is well documented in the fossil record. Q: The fossil record shows that this type of event is followed by the evolution of new species to fill the habitats where old species lived? Choices: - minor extinction - moderate extinction - formation extinction - mass extinction A:
Answer: mass extinction
*Question*
Answer the following question given this paragraph: When plates are pushed or pulled, the rock is subjected to stress. Stress can cause a rock to change shape or to break. When a rock bends without breaking, it folds. When the rock breaks, it fractures. Mountain building and earthquakes are some of the responses rocks have to stress. Q: Mountain building and earthquakes are some of the responses of rocks when subected to what? Choices: - time - erosion - weather - stress A:
**Answer**
stress
Answer the following question given this paragraph: Each organism has the ability to survive in a specific environment. Dry desert environments are difficult to live in. Desert plants have special stems and leaves to conserve water. Animals have other ways to live in the desert. The Namib Desert receives only 1.5 inches of rainfall each year. The Namib Desert beetle lives there. How do the beetles get enough water to survive? Early morning fog deposits water droplets. The droplets collect on a beetle's wings and back. The beetle tilts its rear end up. When the droplet is heavy enough, it slides forward. It lands in the beetle's mouth. There are many other environments that need unique approaches for survival ( Figure below ). Q: Desert plants have special stems and leaves to conserve what? Choices: - food - air - habitat - water A:
water