Biology & Science Questions: Video Series

Rust is a common term that is used to describe the oxidization of iron, which occurs when a stable form of iron has electrons removed and is combined with oxygen. Find out why oxygen and water are necessary for creating rust with help from a science teacher and field biologist in this free video on science questions.

Radiant heat is a type of heat loss that involves radiation, which is when heat is constantly given off by warm objects to a surrounding environment. Find out why radiant heat for a house is usually found in a floor with help from a science teacher and field biologist in this free video on science questions.

The surface gravity of Mars is 39 percent of Earth's surface gravity, and it is measured at 3.8 meters per second. Find out how surface gravity is calculated with help from a science teacher and field biologist in this free video on science questions.

Radon is a radioactive noble gas that is colorless and odorless, and although it is dangerous, it can be used in radiotherapy to treat cancer and by atmospheric scientists to track movements of air masses. Learn about the dangers of exposure to radon with help from a science teacher and field biologist in this free video on science questions.

Reproductive cloning refers to a specific technique in which a donor adult cell is transferred into the egg of another. Discover why reproductive cloning is considered to be the form of cloning that most people recognize with help from a science teacher and field biologist in this free video on science questions.

Biotechnology uses living systems and organisms to develop or make processes, and it is usually seen in agriculture, food production and medicine production. Discover how biotechnology has been used to produce insulin with help from a science teacher and field biologist in this free video on science questions.

There are three main species of redwood trees, including the coastal redwood, the giant sequoia and the dawn redwood. Learn about coastal redwoods, which can grow to more than 350 feet tall with help from a science teacher and field biologist in this free video on science.

Stem cell research uses stem cells to find new avenues, and some research is basic, while other research involves applying stem cells to the field of medicine. Find out how stem cell research is being used for bone marrow transplants with help from a science teacher and field biologist in this free video on science questions.

There are several causes of global warming, including changes in solar radiation, volcanic dust and natural greenhouse gases. Learn about how humans contribute to global warming through the burning of fossil fuels with help from a science teacher and field biologist in this free video on science.

The major cause of waves, specifically ocean waves, is wind, although waves can also be created by tides and earthquakes. Discover how waves are simply the result of winds passing over water with help from a science teacher and field biologist in this free video on science questions.

The Earth's plates have transform boundaries, which involves plates moving in opposite directions, and they also have diverted boundaries, which involves plates spreading apart. Find out how plates come together in convergent boundaries with help from a science teacher and field biologist in this free video on science questions.

People float in the Dead Sea because the water is much more dense and heavy than regular water, and this is a result of all of the salt that has dissolved in the Dead Sea. Discover how density in water pushes an object up to keep it afloat with help from a science teacher and field biologist in this free video on science questions.

Glucose is an organic molecule, a simple sugar that consists of six carbons, 12 hydrogens and six oxygens. Discover how glucose is made during photosynthesis by plants with help from a science teacher and field biologist in this free video on science questions.

One example of a weak organic acid is lactic acid, which is commonly found in milk and has a structure with three carbons. Find out how weak acids are things that only partially dissociate in water with help from a science teacher and field biologist in this free video on science questions.

Fog occurs when the air temperature comes within four degrees Fahrenheit of the dew point, and the dew point is the temperature at which the water goes from gas to liquid. Learn more about fog and its association with low visibility with help from a science teacher and field biologist in this free video on science questions.

Saturn's distance from the sun is 1.4 billion kilometers, and its diameter is 120,536 kilometers. Discover why Saturn's distance from the sun is one of the main reasons why it's a gas planet with help from a science teacher and field biologist in this free video on science questions.

Carbon is important to living systems in that it is found in every form of life, and it can form long chains of molecules that perform a variety of functions. Discover carbon's importance in the formation of DNA and RNA with help from a science teacher and field biologist in this free video on science questions.

Earth's surface is primarily composed of seven major elements that are found in abundance, including oxygen, silicon, aluminum, iron, magnesium, calcium and potassium. Learn about the major types of mineral groups found in the Earth's crust with help from a science teacher and field biologist in this free video on science questions.

Wind power is a form of renewable energy, it's a domestic source of energy, and it is a reliable and quiet form of energy. Discover disadvantages of wind power, such as the cost, with help from a science teacher and field biologist in this free video on science questions.

Atmospheric pressure is the weight of air molecules above an object, so atmospheric pressure gets lower the farther one moves away from Earth. Discover why people's ears pop on airplanes with help from a science teacher and field biologist in this free video on science questions.

The structure of an atom consists primarily of three parts, including neutrons, protons and electrons. Find out how the main component of an atom is space with help from a science teacher and field biologist in this free video on science questions.

A firefly produces light by taking advantage of a chemical reaction in which luciferin combines with oxygen in the presence of luciferase to produce oxyluciferin, energy and light. Discover how uric acid in a firefly's abdomen allow it to reflect light outwardly with help from a science teacher and field biologist in this free video on science questions.

The purpose of chlorophyll is to pass energy and make glucose, which is then used as energy for a plant. Find out why chlorophyll looks green and how it is used in photosynthesis with help from a science teacher and field biologist in this free video on science questions.

The distance from Venus to the sun is 108.2 million kilometers, but it can vary to about 107.5 million kilometers at times. Discover why Venus is much warmer than many people would think due to its distance from the sun with help from a science teacher and field biologist in this free video on science questions.