Earth Science Holt Chapter 2 sec 1 and 2

The outer core of earth is

The law of gravitation, the attraction between 2 objects depends on the masses of the objects and

A system in which energy, but not matter can enter and leave is a

Which layer of the earth makes up 2/3 of earth's mass?

The four spheres of the earth system are Atmosphere, Hydrosphere, Geosphere and

Earth is considered a unique planet because it

Anything that has mass and takes up space is known as

Which are examples of the compositional layers?

Because Earth’s interior is warmer than its surface layers of the asthenosphere, hot materials move to the surface by

Who was the first to explain the effects of gravity in his law of gravitation?

A closed system is a system in which the only thing exchanged with the surroundings is

Which is closest to the age of the earth according to the notes?

What percent of the earth's water is fresh?

The only planet with liquid water is

The upper boundary of Earth’s mantle is called the

Parts working together for the same purpose can be called a

Energy is transferred between systems, but it cannot be created or destroyed, according to the

Approximately 71% of Earth’s surface is covered by the

Electromagnetic radiation is energy.

The hydrosphere is all the ___________ on earth.

Energy is the ability

The most abundant gas in the atmosphere is

The law of conservation of energy says

What type of waves were used to learn about earth's layers?

The force of attraction that exists among all matter in the universe is called

The most important external energy source for the earth system is the

Which of the following is a possible source of Earth’s magnetic field?

the strong, lower part of the mantle between the asthenosphere and the outer core

Earth’s circumference is about 40,000 km, and its shape is

Earth is considered a closed system

Matter is anything that takes up space and has

The solid, plastic layer of the earth is called the