What causes the night sky to seem to shift westward throughout the night? The westward shift of the sky throughout the night is due to Earth’s spin under the stars. Meanwhile, the westward shift of the stars throughout the seasons is due to Earth’s motion in orbit around the sun. Earth’s motion in orbit causes […]

Who is at the top of the food chain? An apex predator, also known as an alpha predator or top predator, is a predator at the top of a food chain, without natural predators. Apex predators are usually defined in terms of trophic dynamics, meaning that they occupy the highest trophic levels. What is the […]

Why are acids important and what are they used for? Acids and bases are important in living things because most enzymes can do their job only at a certain level of acidity. Cells secrete acids and bases to maintain the proper pH for enzymes to work. For example, every time you digest food, acids and […]

What is the amount of water vapor in the air called? humidity What is water Vapour in the air? Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or […]

What gets broken down in fermentation and cellular respiration? Cellular respiration, like burning, results in the complete oxidation of glucose into CO2 and water. Fermentation, on the other hand, does not fully oxidize glucose. Instead, small, reduced organic molecules are produced as waste. As a result, cellular respiration releases more energy from glucose than fermentation. […]

How far the atmosphere is spread on the earth from the surface? It extends from Earth’s surface to an average height of about 12 km (7.5 mi; 39,000 ft), although this altitude varies from about 9 km (5.6 mi; 30,000 ft) at the geographic poles to 17 km (11 mi; 56,000 ft) at the Equator, […]

What is the climate on Mercury? The average temperature on Mercury is a balmy 354 degrees F. In addition, since Mercury has virtually no atmosphere to scatter light, the sky would be black, even though the Sun’s disk itself would be over twice as large as what we observe from the Earth. What temperature can […]

How do waves affect a coastal town? The breaking waves and resulting currents pick up and move sand, making beaches dynamic, perpetually in motion. For example, sand eroded from the beach during winter storms may move offshore to form a sandbar. That causes waves to break farther offshore, protecting the beach from further erosion. How […]

Why is a platypus classified as a mammal? The platypus is classed as a mammal because it has fur and feeds its young with milk. It flaps a beaver-like tail. What is a platypus classified as? The classification of the platypus as a mammal—the same group of animals that includes dolphins, elephants, and humans—has not […]

What 2 forms of energy are produced by the sun? Remember that the Sun provides two types of energy: Heat and Light. What two things does the sun provide to earth? The Sun warms our seas, stirs our atmosphere, generates our weather patterns, and gives energy to the growing green plants that provide the food […]