Mechanical weathering physically breaks down rocks without changing their composition, while chemical weathering alters the chemical composition. Both types of weathering are influenced by climate and contribute to the erosion of rocks.
Mechanical weathering is the physical breakdown of rocks into smaller pieces without changing the composition of the rock, while chemical weathering is the process that alters the chemical composition of rocks, causing them to break down. Mechanical weathering can occur through processes like frost wedging, abrasion, and exfoliation, whereas chemical weathering can occur through processes like oxidation, hydration, and carbonation.
Despite their differences, there are some similarities between mechanical and chemical weathering. Both processes can be influenced by climate and environmental conditions, such as temperature and rainfall. Additionally, both types of weathering contribute to the overall breakdown and erosion of rocks, ultimately shaping the Earth's surface.
Learn more about Mechanical and Chemical Weathering here:
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Answer:
D. The variable in an experiment that is manipulated by the scientist.
Explanation:
The independent variable is what is purposely changed or controlled to see what the effect is.
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Answer:
the variable is an experiment that is manipulated by the scientist
Explanation:
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A baby's bones begin to grow in the womb. At birth, the skeleton is partially formed. Many bones are still in "parts." The ends (epiphyses) and bony shafts (diaphyses) of long bones form separately in the womb. At birth, the ends of the long bones are mainly cartilage, with centers of bone beginning to form inside. As a child grows, the shafts get longer, and bone gradually replaces the cartilage epiphyses. Through the growing years, a layer of cartilage (the growth plate) separates each epiphyses from the bone shaft.
Clavicle. Image courtesy of: Smithsonian InstitutionBetween 17 and 25 years, normal growth stops. The development and union of separate bone parts is complete. At this point, you and your skeleton are as tall as you are going to get - with many fewer bone parts than you started with!
Facts:The clavicle (collar bone), pictured above, is the last bone to complete growth, at about age 25.Measuring the length of long bones can give an estimate of age for children, but this technique is useful only until bones have stopped growing.The tibia completes growth at about age 16 or 17 in girls, and 18 or 19 in boys.For toddlers to teenagers up to age 21, teeth are the most accurate age indicators. Learn more here!In AdultsSkeletons record an adult's age in several ways. The surfaces of the cranium, pubic bones, and rib ends hold clues. At the microscopic level, investigators can see the bone "remodeling" that takes place throughout life, as well as age-related bone breakdown.
Bone "Remodeling"Femur cross sections of adults ages 24 (left) and 77 (right). Images courtesy of: Smithsonian InstitutionEven after childhood growth stops, bone "remodeling" continues. Throughout a lifetime, bone makes new osteons — minute tubes containing blood vessels. Microscopic exams show these changes, which can indicate adult age to within 5 to 10 years. Younger adults have fewer and larger osteons. Older adults have smaller osteons and more osteon fragments, as new ones form and disrupt older ones.
Clues in the CraniumCraniums of a 20 year-old (left) and a 70 year-old (right). Images courtesy of: Smithsonian InstitutionThe bones that enclose the brain grow together during childhood along lines called cranial sutures. During adulthood, bone "remodeling" may gradually erase these lines, at variable rates. Closure of cranial sutures gives general information about a person's age. It is best used with additional indicators to estimate age, or when other age indicators are unavailable.
Other Age-Related ChangesArthritis on the spine as evidenced by "lipping" of the vertebrae. Image courtesy of: Smithsonian InstitutionWear and tear on a body throughout a lifetime affects the skeleton. Arthritis of the spine and joints can reflect increasing age. Scientists also recognize many other clues to aging, such as the appearance of the rib ends and the cartilage that joins them to the sternum. In a young adult, the rib end walls are thick and smooth, with a scalloped or rounded edge. In an older adult, the walls are thin, with sharp edges, and the rim often has bony, irregular projections.
The answer is mitochondria because it is the power house of the cell and makes the energy
1. Captive breeding: We capture and wait for two organisms of the same species to breed.
2. Laws: Create laws to limit the amount of organism killings.
3. Preserve Habitats: Preserve natural habitat so that animals can breed.
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