Layers of the Earth based on chemical composition and physical properties
Earth can be divided into three layers based on chemical composition: the crust, the mantle,
and the core.
Earth is also divided into layers based on physical
properties, such as whether the layer is solid or liquid.
The five physical layers are the lithosphere, asthenosphere,
mesosphere, outer core, and inner core.

The cytoplasm is the fluid found in cells.
Cytoplasm is found in eukaryotic and prokaryotic cells.
The fluid of cytoplasm is called cytosol. It is made up mainly of water
The organelles are found floating in this liquid along with many other items
You can almost think of the cytoplasm as a crowded swimming pool

Description of the sea floor. The description includes the continental shelf,slope, sea mont, abyssal plain and an ocean trench

Learn how we classify living things using taxonomic rank. There are 8 levels of classification.
How do you create names for organisms that can be used anywhere in the world? This is where taxonomic classification, also called the Linnaean system, comes into play. Change music

Named after its inventor, Carl Linnaeus, a Swedish botanist, zoologist, and physician, the Linnaean classification system has 8 levels of classification. You may also hear this called a taxonomic rank. You will often see the levels displayed like a triangle. This is because the levels at the top are broad and general whereas the levels at the bottom are more specific. As you move down levels of taxonomic classification, the organisms will be more similar to one another.

The 8 levels of Taxonomic Classification are:

Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species

Element vs Compound
An element is a pure substance. In other words, an element cannot be broken down into a simpler substance by physical or chemical means.An element is made up of only one type of atom. An atom consists of a proton, neutron, and an electron. Some common examples of an element would be carbon, oxygen, or iron. The elements are arranged in the periodic table based on their number of protons. For example, sodium has 11 protons, potassium has 19
The number of protons of elements always stays the same.
Each element also has its own unique set of properties.

A compound is a pure substance of two or more elements chemically combined. Elements combine during a chemical change. A particle of a compound is called a molecule.
When the elements combine chemically a new substance is created.
The compound has different properties than the elements that make it
Hydrogen and oxygen are gases but they combine to make liquid water.
Here are some items that combine to make compounds
Table salt is sodium and chlorine
Glucose is made of carbon-hydrogen-oxygen
When elements create a compound they always join in a specific ratio
The ratio of water is hydrogen to oxygen is 2 to 1
If a compound has a different ratio of hydrogen to oxygen then it is not water
Glucose a type of sugar has a ratio of c6 h12 o6 which is 6 carbons 12 hydrogens and 6 oxygens
Glucose will always have this same ratio
Compounds are all around you
In the food you eat, the school supplies you use, your clothes and even you

In this video, I describe the similarities and differences between prokaryotic and eukaryotic cells in clear and simple terms. My goal is to help you understand the difference between the different types of cells.
All living things are made of cells but they may be different.
First, cells can be prokaryotic or eukaryotic cells.
Prokaryotic cells can be classified as bacteria or archaea.
Eukaryotic cells can be classified as plant or animal cells.

Learn to calculate average velocity. Velocity is a vector because it measures magnitude and direction.
The formula for average velocity equals
velocity = displacement divided by change in time
In this video, I solve two basic average velocity problems.

Learn how to convert a mixed number, which is also called a mixed fraction, to an improper fraction. A mixed number has a whole number plus a fraction.
The denominator of the improper fraction is the same denominator of the mixed fraction.
You have a whole number part and a fractional part.
The denominator of the fraction tells you how many parts each whole number is worth.
The mixed number 2 and ⅔ each whole number is worth 3
Therefore, with 2 and ⅔ you have 3 times 2 which equal 6 parts plus you have 2 in the numerator so it becomes 6 plus 2 which equals 8 and you always keep the same denominator of the fraction so the improper fraction equals 8/3

Video Guide
00:00 Introduction What is a mixed number
00:18 Convert 2 2/3 to ImproperFraction
00:51 Convert 3 3/4 to Improper Fraction
01:25 Convert 5 3/4 to ImproperFraction
02:41 Convert 6 1/2 to Improper Fraction