The Earth’s interior is composed of several layers: the crust, the mantle and the core. Scientists used waves and their speed to study the Earth's interior. The speed of seismic waves is affected by the properties of the material the waves pass through. The stiffness of material affects the speed of these waves. P-waves, or pressure waves, go through both liquids and solids, while S-waves, or shear waves go through solids but not liquids. The following helped scientists understand that Earth's interior is liquid: S waves cannot travel through liquids. Correct answer: D
FSMA or also known as Food Safety Modernization Act which is approved and signed by President Barrack Obama last January 7, 2017 to ensure that the food to be distributed is safe to eat first. This adds to the burden of FDA or Food and Drug Administration since a new enforcement and inspection authorities has to be made but it helps them in reducing the risk of spreading the disease at the prevention stage rather than relying on the problem after they occur. According to the Act, FDA ensures the public health by strengthening the food safety and quality system.
The correct answers are.
A. A fault breaks through sedimentary layers.
B. Sedimentary layers form and then are tilted.
C. Igneous rock forms between sedimentary layers.
Hope this helps!
Earth’s atmosphere is mainly composed of nitrogen (N) and oxygen (O).
This is further subdivided into four layers according to their temperatures.
Troposphere the layer closes to the Earth's surface with 10-15 km above its
surface. Stratosphere is 15 to 50 km above the surface of the Earth and its top
is warmer than its bottom. Mesosphere extends 50
to 80 km and becomes colder with increasing altitude. <span>And thermosphere is
80 km above the surface of the Earth to outer space and is very hot.</span>