67. weather and erosion are related to what type of rock (sedimentary, igneous or metamorphic)?\n68…

Brief Explanations:

• Question 67: Weather and erosion break down pre - existing rocks and the sediments are deposited to form sedimentary rocks. So weather and erosion are mainly related to sedimentary rocks.
• Question 68: Igneous rocks form from the cooling and solidification of magma or lava. Plate tectonics can cause magma to rise and form igneous rocks. Metamorphic rocks are formed under high pressure and temperature conditions often associated with mountain - building processes and plate tectonics. So they are related to igneous and metamorphic rocks.
• Question 69: Meiosis involves crossing - over and independent assortment of chromosomes, which leads to genetic variation in the offspring. Genetic variation provides a greater chance for the offspring to adapt to changing environments and thus have a better survival chance.
• Question 70: A food web is a complex network of interconnected food chains in an ecosystem, showing the feeding relationships among different organisms. The sun is the primary source of energy that powers the food web through the process of photosynthesis in producers.

Answer:

• 67. Sedimentary
• 68. Igneous, Metamorphic
• 69. It creates genetic variation.
• 70. A food web is a complex network of interconnected food chains in an ecosystem. The sun powers the food web.