Tectonic plate boundaries
This boundary creates mid-ocean ridges.
Divergent boundary
Alfred Wegener proposed this theory in 1912.
Continental drift
The smallest unit of matter that retains chemical properties.
An atom
This must be balanced in every chemical equation.
Atoms
This law states that the total mass of reactants equals the total mass of products.
Law of conservation of mass
At this boundary, plates move toward each other, often forming mountains.
Convergent boundary
Fossils of Mesosaurus found in South America and Africa support this theory.
Continental drift
Two or more atoms bonded together form this.
A molecule
In the equation 2H₂ + O₂ → 2H₂O, H₂ and O₂ are called this.
Reactants
Burning wood releases heat, an example of conservation of this.
Energy
Earthquakes are common along this boundary where plates slide past each other.
Transform boundary
The matching coastlines of South America and Africa provide evidence for this theory.
Continental drift
Water (H₂O) is an example of this type of substance.
In the same equation, H₂O is called this.
2H₂ + O₂ → 2H₂O, H₂
Products
In a closed system, this quantity remains constant during a chemical reaction.
Mass
The Himalayas (Mountains) were formed at this type of boundary.
Convergent boundary
Coal deposits found in Antarctica support this theory because they indicate past climate conditions.
Tropical climate
The number of protons in an atom determines this property of the element.
Atomic number
This type of equation uses words instead of symbols.
Word equation
Energy absorbed in photosynthesis is an example of this type of reaction.
Endothermic
Volcanoes often form at this boundary due to subduction.
Convergent boundary
This supercontinent existed about 300 million years ago.
Pangaea
Gold (Au) is classified as this type of pure substance.
An element
In the equation CH₄ + 2O₂ → CO₂ + 2H₂O, the number “2” in front of O₂ is called this.
Coefficient
Energy released in combustion is an example of this type of reaction.
Exothermic