Grade 4 Science

The mesosphere is:

• The part of the crust under the oceans

• A gaseous layer

• The lower part of the mantle

• The outer core

The Earth's crust is composed mainly of:

• Iron and nickel

• Water and air

• Lava

• Silicate rocks

Which layer is responsible for Earth’s magnetic field?

•  Lithosphere

• Mantle

• Inner core

• Outer core

The mantle is made mostly of:

• Water and sand

• Carbon and oxygen

• Silicate minerals with magnesium and iron

•  Ice and rock

The rigid outer layer made of the crust and upper mantle is called the:

•  Mesosphere

•  Lithosphere

• Core

• Asthenosphere

What keeps the inner core solid despite the extreme heat?

• High pressure

• It’s made of ice

• It is frozen by the mantle

• Lack of heat

The Earth’s core makes up about:

• One-tenth of the Earth's mass

• One-fourth of the Earth's mass

• One-third of the Earth's mass

• Half of the Earth's mass

Squirrel would likely be best able to find its food source during the day when there is bright light

• True
• False

Tarsier is not likely to finds its food source at night when there is only a little light.

• True
• False

The Earth has three main layers based on ___________ composition.